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Compress excutable files in place.
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them. FYI: You can compress any executable sha-bang scripts as well (py, pl, sh, tcl, etc.).

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Test a serial connection
If the connection works you should see a "hello" on host A. If not: check your cabeling etc :-)

Show a Command's Short Description
The whatis command displays a short description for the command you list on the command line. It is useful to quickly learn what a command does

Colorize matching string without skipping others
this is useful to highlight only some code without losing other lines (eg. software, logs, scripts)

Synchronize date and time with a server over ssh
If you are stuck behind a firewall and want to synchronize time with another server but you do not want to port forward NTP (which uses UDP) then this command is handy. It gets the time from a server and sets the local time. It is not that accurate but I can live with a second or so drift.

Quickly create simple text file from command line w/o using vi/emacs
1. Issue command 2. After angled bracket appears, enter file contents 3. When done, type "EOF"

list files recursively by size

show the difference

purge installed but unused linux headers, image, or modules
will purge: only installed apps: /^ii/!d avoiding current kernel stuff: /'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d using app names: s/^[^ ]* [^ ]* \([^ ]*\).*/\1/ avoiding stuff without a version number: /[0-9]/!d


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