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Delete Last Line of a File if it is Blank
Use sed to remove the last line of a file only if it is empty.

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

mailx to send mails from console
It is the best way i found to send a mail from the console in my centos server.

Sort a character string
Sorts a character string, using common shell commands.

Two command output
Summarize established connections after netstat output. Using tee and /dev/stderr you can send one command output to terminal before executing wc so you can summarize at the bottom of the output.

sends a postscript file to a postscript printer using netcat

Download all manuals RedHat 7 (CentOS/Fedora) with one command in Linux

Search some text from all files inside a directory

Show numerical values for each of the 256 colors in bash
Same as http://www.commandlinefu.com/commands/view/5876, but for bash. This will show a numerical value for each of the 256 colors in bash. Everything in the command is a bash builtin, so it should run on any platform where bash is installed. Prints one color per line. If someone is interested in formatting the output, paste the alternative.

list block devices
Shows all block devices in a tree with descruptions of what they are.


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