UNIX Command Line Handout
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Program #6: Word Count
CSc 227 — Program Design and Development Spring 2014 (McCann) http://www.cs.arizona.edu/classes/cs227/spring14/ Program #6: Word Count Due Date: March 11 th, 2014, at 9:00 p.m. MST Overview: The UNIX operating system (and its variants, of which Linux is one) includes quite a few useful utility programs. One of those is wc, which is short for Word Count. The purpose of wc is to give users an easy way to determine the size of a text file in terms of the number of lines, words, and bytes it contains. (It can do a bit more, but that’s all of the functionality that we are concerned with for this assignment.) Counting lines is done by looking for “end of line” characters (\n (ASCII 10) for UNIX text files, or the pair \r\n (ASCII 13 and 10) for Windows/DOS text files). Counting words is also straight–forward: Any sequence of characters not interrupted by “whitespace” (spaces, tabs, end–of–line characters) is a word. Of course, whitespace characters are characters, and need to be counted as such. A problem with wc is that it generates a very minimal output format. Here’s an example of what wc produces on a Linux system when asked to count the content of a pair of files; we can do better! $ wc prog6a.dat prog6b.dat 2 6 38 prog6a.dat 32 321 1883 prog6b.dat 34 327 1921 total Assignment: Write a Java program (completely documented according to the class documentation guidelines, of course) that counts lines, words, and bytes (characters) of text files. -
DC Console Using DC Console Application Design Software
DC Console Using DC Console Application Design Software DC Console is easy-to-use, application design software developed specifically to work in conjunction with AML’s DC Suite. Create. Distribute. Collect. Every LDX10 handheld computer comes with DC Suite, which includes seven (7) pre-developed applications for common data collection tasks. Now LDX10 users can use DC Console to modify these applications, or create their own from scratch. AML 800.648.4452 Made in USA www.amltd.com Introduction This document briefly covers how to use DC Console and the features and settings. Be sure to read this document in its entirety before attempting to use AML’s DC Console with a DC Suite compatible device. What is the difference between an “App” and a “Suite”? “Apps” are single applications running on the device used to collect and store data. In most cases, multiple apps would be utilized to handle various operations. For example, the ‘Item_Quantity’ app is one of the most widely used apps and the most direct means to take a basic inventory count, it produces a data file showing what items are in stock, the relative quantities, and requires minimal input from the mobile worker(s). Other operations will require additional input, for example, if you also need to know the specific location for each item in inventory, the ‘Item_Lot_Quantity’ app would be a better fit. Apps can be used in a variety of ways and provide the LDX10 the flexibility to handle virtually any data collection operation. “Suite” files are simply collections of individual apps. Suite files allow you to easily manage and edit multiple apps from within a single ‘store-house’ file and provide an effortless means for device deployment. -
AEDIT Text Editor Iii Notational Conventions This Manual Uses the Following Conventions: • Computer Input and Output Appear in This Font
Quick Contents Chapter 1. Introduction and Tutorial Chapter 2. The Editor Basics Chapter 3. Editing Commands Chapter 4. AEDIT Invocation Chapter 5. Macro Commands Chapter 6. AEDIT Variables Chapter 7. Calc Command Chapter 8. Advanced AEDIT Usage Chapter 9. Configuration Commands Appendix A. AEDIT Command Summary Appendix B. AEDIT Error Messages Appendix C. Summary of AEDIT Variables Appendix D. Configuring AEDIT for Other Terminals Appendix E. ASCII Codes Index AEDIT Text Editor iii Notational Conventions This manual uses the following conventions: • Computer input and output appear in this font. • Command names appear in this font. ✏ Note Notes indicate important information. iv Contents 1 Introduction and Tutorial AEDIT Tutorial ............................................................................................... 2 Activating the Editor ................................................................................ 2 Entering, Changing, and Deleting Text .................................................... 3 Copying Text............................................................................................ 5 Using the Other Command....................................................................... 5 Exiting the Editor ..................................................................................... 6 2 The Editor Basics Keyboard ......................................................................................................... 8 AEDIT Display Format .................................................................................. -
COMMAND LINE CHEAT SHEET Presented by TOWER — the Most Powerful Git Client for Mac
COMMAND LINE CHEAT SHEET presented by TOWER — the most powerful Git client for Mac DIRECTORIES FILES SEARCH $ pwd $ rm <file> $ find <dir> -name "<file>" Display path of current working directory Delete <file> Find all files named <file> inside <dir> (use wildcards [*] to search for parts of $ cd <directory> $ rm -r <directory> filenames, e.g. "file.*") Change directory to <directory> Delete <directory> $ grep "<text>" <file> $ cd .. $ rm -f <file> Output all occurrences of <text> inside <file> (add -i for case-insensitivity) Navigate to parent directory Force-delete <file> (add -r to force- delete a directory) $ grep -rl "<text>" <dir> $ ls Search for all files containing <text> List directory contents $ mv <file-old> <file-new> inside <dir> Rename <file-old> to <file-new> $ ls -la List detailed directory contents, including $ mv <file> <directory> NETWORK hidden files Move <file> to <directory> (possibly overwriting an existing file) $ ping <host> $ mkdir <directory> Ping <host> and display status Create new directory named <directory> $ cp <file> <directory> Copy <file> to <directory> (possibly $ whois <domain> overwriting an existing file) OUTPUT Output whois information for <domain> $ cp -r <directory1> <directory2> $ curl -O <url/to/file> $ cat <file> Download (via HTTP[S] or FTP) Copy <directory1> and its contents to <file> Output the contents of <file> <directory2> (possibly overwriting files in an existing directory) $ ssh <username>@<host> $ less <file> Establish an SSH connection to <host> Output the contents of <file> using -
UNIX Commands
UNIX commands ls list the contents of a directory ls -l list the content of a directory with more details mkdir <directory> create the directory <directory> cd <directory> change to the directory <directory> cd .. move back one directory cp <file1> <file2> copy the file <file1> into <file2> mv <file1> <file2> move the file <file1> to <file2> rm <file> remove the file <file> rmdir <directory> delete the directory <directory> man <command> display the manual page for <command> module load netcdf load the netcdf commands to use module load ferret load ferret module load name load the module “name” to use its commands vi <file> read the content of the file <file> vimdiff <file1> <file2> show the differences between files <file1> and <file2> pwd show current directory tar –czvf file.tar.gz file compress one or multiple files into file.tar.gz tar –xzvf file.tar.gz extract the compressed file file.tar.gz ./name execute the executable called name qsub scriptname submits a script to the queuing system qdel # cancel the submitted job number # from the queue qstat show queued jobs qstat –u zName show only your queued jobs Inside vi ESC, then :q! Quit without saving ESC, then :wq Quit with saving ESC, then i Get in insert mode to edit text ESC, then /word Search content for word ESC, then :% Go to end of document ESC, then :0 Go to beginning of document ESC, then :set nu Add line numbers ESC, then :# Go to line number # N.B.: If inside vimdiff, you have 2 files opened, so you need to quit vi twice. -
Windows Command Prompt Cheatsheet
Windows Command Prompt Cheatsheet - Command line interface (as opposed to a GUI - graphical user interface) - Used to execute programs - Commands are small programs that do something useful - There are many commands already included with Windows, but we will use a few. - A filepath is where you are in the filesystem • C: is the C drive • C:\user\Documents is the Documents folder • C:\user\Documents\hello.c is a file in the Documents folder Command What it Does Usage dir Displays a list of a folder’s files dir (shows current folder) and subfolders dir myfolder cd Displays the name of the current cd filepath chdir directory or changes the current chdir filepath folder. cd .. (goes one directory up) md Creates a folder (directory) md folder-name mkdir mkdir folder-name rm Deletes a folder (directory) rm folder-name rmdir rmdir folder-name rm /s folder-name rmdir /s folder-name Note: if the folder isn’t empty, you must add the /s. copy Copies a file from one location to copy filepath-from filepath-to another move Moves file from one folder to move folder1\file.txt folder2\ another ren Changes the name of a file ren file1 file2 rename del Deletes one or more files del filename exit Exits batch script or current exit command control echo Used to display a message or to echo message turn off/on messages in batch scripts type Displays contents of a text file type myfile.txt fc Compares two files and displays fc file1 file2 the difference between them cls Clears the screen cls help Provides more details about help (lists all commands) DOS/Command Prompt help command commands Source: https://technet.microsoft.com/en-us/library/cc754340.aspx. -
Process Text Streams Using Filters
Process Text Streams Using Filters OBJECTIVE: Candidates should should be able to apply filters to text streams. 1 Process Text Streams Using Filters KeyKEY knowledge KNOWLEDGE area(s): AREAS: Send text files and output streams through text utility filters to modify the output using standard UNIX commands found in the GNU textutils package. 2 Process Text Streams Using Filters KEY FILES,TERMS, UTILITIES cat nl tail cut paste tr expand pr unexpand fmt sed uniq head sort wc hexdump split join tac 3 cat cat the editor - used as a rudimentary text editor. cat > short-message we are curious to meet penguins in Prague Crtl+D *Ctrl+D - command is used for ending interactive input. 4 cat cat the reader More commonly used to flush text to stdout. Options: -n number each line of output -b number only non-blank output lines -A show carriage return Example cat /etc/resolv.conf ▶ search mydomain.org nameserver 127.0.0.1 5 tac tac reads back-to-front This command is the same as cat except that the text is read from the last line to the first. tac short-message ▶ penguins in Prague to meet we are curious 6 head or tail using head or tail - often used to analyze logfiles. - by default, output 10 lines of text. List 20 first lines of /var/log/messages: head -n 20 /var/log/messages head -20 /var/log/messages List 20 last lines of /etc/aliases: tail -20 /etc/aliases 7 head or tail The tail utility has an added option that allows one to list the end of a text starting at a given line. -
Modern Programming Languages CS508 Virtual University of Pakistan
Modern Programming Languages (CS508) VU Modern Programming Languages CS508 Virtual University of Pakistan Leaders in Education Technology 1 © Copyright Virtual University of Pakistan Modern Programming Languages (CS508) VU TABLE of CONTENTS Course Objectives...........................................................................................................................4 Introduction and Historical Background (Lecture 1-8)..............................................................5 Language Evaluation Criterion.....................................................................................................6 Language Evaluation Criterion...................................................................................................15 An Introduction to SNOBOL (Lecture 9-12).............................................................................32 Ada Programming Language: An Introduction (Lecture 13-17).............................................45 LISP Programming Language: An Introduction (Lecture 18-21)...........................................63 PROLOG - Programming in Logic (Lecture 22-26) .................................................................77 Java Programming Language (Lecture 27-30)..........................................................................92 C# Programming Language (Lecture 31-34) ...........................................................................111 PHP – Personal Home Page PHP: Hypertext Preprocessor (Lecture 35-37)........................129 Modern Programming Languages-JavaScript -
A Brief Introduction to Unix-2019-AMS
Brief Intro to Linux/Unix Brief Intro to Unix (contd) A Brief Introduction to o Brief History of Unix o Compilers, Email, Text processing o Basics of a Unix session o Image Processing Linux/Unix – AMS 2019 o The Unix File System Pete Pokrandt o Working with Files and Directories o The vi editor UW-Madison AOS Systems Administrator o Your Environment [email protected] o Common Commands Twitter @PTH1 History of Unix History of Unix History of Unix o Created in 1969 by Kenneth Thompson and Dennis o Today – two main variants, but blended o It’s been around for a long time Ritchie at AT&T o Revised in-house until first public release 1977 o System V (Sun Solaris, SGI, Dec OSF1, AIX, o It was written by computer programmers for o 1977 – UC-Berkeley – Berkeley Software Distribution (BSD) linux) computer programmers o 1983 – Sun Workstations produced a Unix Workstation o BSD (Old SunOS, linux, Mac OSX/MacOS) o Case sensitive, mostly lowercase o AT&T unix -> System V abbreviations 1 Basics of a Unix Login Session Basics of a Unix Login Session Basics of a Unix Login Session o The Shell – the command line interface, o Features provided by the shell o Logging in to a unix session where you enter commands, etc n Create an environment that meets your needs n login: username n Some common shells n Write shell scripts (batch files) n password: tImpAw$ n Define command aliases (this Is my password At work $) Bourne Shell (sh) OR n Manipulate command history IHateHaving2changeMypasswordevery3weeks!!! C Shell (csh) n Automatically complete the command -
101 Useful Linux Commands - Haydenjames.Io
101 Useful Linux Commands - haydenjames.io Some of these commands require elevated permissions (sudo) to run. Enjoy! 1. Execute the previous command used: !! 2. Execute a previous command starting with a specific letter. Example: !s 3. Short way to copy or backup a file before you edit it. For example, copy nginx.conf cp nginx.conf{,.bak} 4. Toggle between current directory and last directory cd - 5. Move to parent (higher level) directory. Note the space! cd .. 6. Go to home directory cd ~ 7. Go to home directory cd $HOME 8. Go to home directory (when used alone) cd 9. Set permissions to 755. Corresponds to these permissions: (-rwx-r-x-r-x), arranged in this sequence: (owner-group-other) chmod 755 <filename> 10. Add execute permission to all users. chmod a+x <filename> 11. Changes ownership of a file or directory to . chown <username> 12. Make a backup copy of a file (named file.backup) cp <file> <file>.backup 13. Copy file1, use it to create file2 cp <file1> <file2> 14. Copy directory1 and all its contents (recursively) into directory2 cp -r <directory1> <directory2>/ 15. Display date date 16. Zero the sdb drive. You may want to use GParted to format the drive afterward. You need elevated permissions to run this (sudo). dd if=/dev/zero of=/dev/sdb 17. Display disk space usage df -h 18. Take detailed messages from OS and input to text file dmesg>dmesg.txt 19. Display a LOT of system information. I usually pipe output to less. You need elevated permissions to run this (sudo). -
The /Proc File System
09 0430 CH07 5/22/01 10:30 AM Page 147 7 The /proc File System TRY INVOKING THE mount COMMAND WITHOUT ARGUMENTS—this displays the file systems currently mounted on your GNU/Linux computer.You’ll see one line that looks like this: none on /proc type proc (rw) This is the special /proc file system. Notice that the first field, none, indicates that this file system isn’t associated with a hardware device such as a disk drive. Instead, /proc is a window into the running Linux kernel. Files in the /proc file system don’t corre- spond to actual files on a physical device. Instead, they are magic objects that behave like files but provide access to parameters, data structures, and statistics in the kernel. The “contents” of these files are not always fixed blocks of data, as ordinary file con- tents are. Instead, they are generated on the fly by the Linux kernel when you read from the file.You can also change the configuration of the running kernel by writing to certain files in the /proc file system. Let’s look at an example: % ls -l /proc/version -r--r--r-- 1 root root 0 Jan 17 18:09 /proc/version Note that the file size is zero; because the file’s contents are generated by the kernel, the concept of file size is not applicable.Also, if you try this command yourself, you’ll notice that the modification time on the file is the current time. 09 0430 CH07 5/22/01 10:30 AM Page 148 148 Chapter 7 The /proc File System What’s in this file? The contents of /proc/version consist of a string describing the Linux kernel version number. -
Unix/Linux Command Reference
Unix/Linux Command Reference .com File Commands System Info ls – directory listing date – show the current date and time ls -al – formatted listing with hidden files cal – show this month's calendar cd dir - change directory to dir uptime – show current uptime cd – change to home w – display who is online pwd – show current directory whoami – who you are logged in as mkdir dir – create a directory dir finger user – display information about user rm file – delete file uname -a – show kernel information rm -r dir – delete directory dir cat /proc/cpuinfo – cpu information rm -f file – force remove file cat /proc/meminfo – memory information rm -rf dir – force remove directory dir * man command – show the manual for command cp file1 file2 – copy file1 to file2 df – show disk usage cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it du – show directory space usage doesn't exist free – show memory and swap usage mv file1 file2 – rename or move file1 to file2 whereis app – show possible locations of app if file2 is an existing directory, moves file1 into which app – show which app will be run by default directory file2 ln -s file link – create symbolic link link to file Compression touch file – create or update file tar cf file.tar files – create a tar named cat > file – places standard input into file file.tar containing files more file – output the contents of file tar xf file.tar – extract the files from file.tar head file – output the first 10 lines of file tar czf file.tar.gz files – create a tar with tail file – output the last 10 lines