List the files in current directory sorted by size ?
- ls -l | grep ^- | sort -nr
List the hidden files in current directory ?
- ls -a1 | grep "^\."
Delete blank lines in a file ? - cat sample.txt | grep -v ‘^$’ > new_sample.txt
Search for a sample string in particular files ? - grep .Debug. *.confHere grep uses the string .Debug. to search in all files with
extension..conf. under current directory.
Display the last newly appending lines of a file during appendingdata to the same file by some processes ? - tail .f Debug.logHere tail
shows the newly appended data into Debug.log by some processes/user.
Display the Disk Usage of file sizes under each directory in currentDirectory ? - du -k * | sort .nr (or) du .k . | sort -nr
Change to a directory, which is having very long name ? - cd CDMA_3X_GEN*Here original directory name is . .CDMA_3X_GENERATION_DATA..
Display the all files recursively with path under current directory ? - find . -depth -print
Set the Display automatically for the current new user ? - export DISPLAY=`eval ‘who am i | cut -d"(" -f2 | cut
-d")" -f1′`Here in above command, see single quote, double quote, grave ascent is used. Observe carefully.
Display the processes, which are running under yourusername ? - ps .aef | grep MaheshvjHere, Maheshvj is the username.
List some Hot Keys for bash shell ? - Ctrl+l . Clears the Screen. Ctrl+r . Does a search in previously given commands in shell. Ctrl+u -
Clears the typing before the hotkey. Ctrl+a . Places cursor at the beginning of the command at shell. Ctrl+e . Places cursor at the end
of the command at shell. Ctrl+d . Kills the shell. Ctrl+z . Places the currently running process into background.
Display the files in the directory by file size ? - ls .ltr | sort .nr .k 5
How to save man pages to a file ? - man <command> | col .b > <output-file>Example : man top | col .b > top_help.txt
How to know the date & time for . when script is executed ? - Add the following script line in shell script.eval echo "Script is
executed at `date`" >> timeinfo.infHere, .timeinfo.inf. contains date & time details ie., when script is executed and
history related to execution.
How do you find out drive statistics ? - iostat -E
Display disk usage in Kilobytes ? - du -k
Display top ten largest files/directories ? - du -sk * | sort -nr | head
How much space is used for users in kilobytes ? - quot -af
How to create null file ? - cat /dev/null > filename1