ls - to list files and sub directories in given directory
chmod - change file permissions .
http://techie-builder.blogspot.com/2010/02/change-permissions-for-file.html
grep -used to search for a string in given file. grep means global regular expression print
vi - used to edit the files. to know more abt the vi editor click here http://www.cs.rit.edu/~cslab/vi.html
ps - ps is the shortage for Process Status. The command should be used to display the currently running processes on Unix/Linux systems.
top - To find out programs CPU time and its memory.
shutdown - to shutdown your system.
du- displays the space taken by files
cat - displays the content of files. example: cat file1
find - Finds one or more files assuming that you know their approximate filenames .
example: find /home -type f -print . this will print all the files from /home dir to down all the levels.
jobs - jobs running in back ground
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