Category: Commands

Command df df command displays the number of free and occupied space on all mounted filesystems systems. Syntax df [options] [filesystem] Options -a displays all file systems. -i

Command cal cal Displays a calendar for any month of any year. Syntax cal [-jy] [[Month_Number] year] Options cal displays a simple calendar. If arguments are not specified,

Command wc Displays the number of bytes, words and lines found in the file. Syntax wc [options] [files] Options -c displays only the number of bytes. -w only

Command unalias Eliminates the abbreviation as defined previously by using the alias. Syntax unalias abbreviation Description command unalias removes the abbreviation as defined previously by using the alias.

Command touch Changes the timestamp of file. Syntax touch [options] files Options -c prescribes not to touch the file if it does not exist. -d time, using the

Command tar tar – Creates archive files or extract files from archives. Syntax tar [options] file_or_directory Options -c: creates a new archive. -d: compares the files from the

Command tail Displays the last few lines of the file. Syntax tail [options] file Options -N (where N – number) displays the last N lines. -n N (where

Command rmdir Deletes the specified directory (if it is empty). Syntax rmdir [options] directory Options -p: remove all parent directories which become empty. -i: stands for interactively -r:

Command rm Removes one or more files. Syntax rm [options] files Options -f deletes files without asking. -i asks for confirmation before deleting files. -r recursively deletes files

Command pwd Prints the current working directory. Syntax pwd Description The command pwd prints the current working directory. It is a built-in command of Bash.