Useful Commands.Pdf

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Lab Guideline Bash: Bash is a free software Unix shell written for the GNU Project. Switch to Bash if you want to use backspace key at terminal. Pico: Pico (Pine composer) is a text editor for Unix and Unix-based computer systems. In our course, Pico is the main text edit we will use for C programming. You can type ‘pico’ to run the edit. Useful commands: ls: Lists the contents of a directory. You can add options like -l to show more information about the files. cd: Changes the directory. And you can type ‘cd ..’ to go back one directory. pwd: Print the working directory (the current directory you are in). mkdir: Makes directories. rmdir: Deletes a directory. It can not be used to remove the directory which contains files. cp: Copies files from one location to another. mv: Renames a file or moves it from one directory to another directory. rm: Deletes a file without confirmation (by default). chmod: Changes the permission of a file. grep: Finds text within a file. cat/more/less: cat: Allows you to look, modify or combine a file. more: Allows information to be displayed one page at a time. less: Opposite of the more command. Can use up/down arrow and search function in less command. wc: Short for word count, wc displays a count of lines, words, and characters in a file. Pipe and redirect: >: redirect the standard output. (e.g.: ls -l > output.txt) >>: redirect the standard output and append. (e.g.: ls -l >> output.txt) |: pipe. Take the output of the first command and treat it as the input for the second one. (e.g.: ls -l | wc ) .

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