Commands using zgrep (9)

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Resume a partially copied file

Filter the output of a file continously using tail and grep

Given process ID print its environment variables
Same as previous but compatible with BSD/IPSO

Create a new file

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"

Randomly run command
Randomly decide whether to run a command, or fail. It's useful for testing purposes. . Usage: ran PERCENTAGE COMMAND [ARGS] Note: In this version the percentage is required. . This is like @sesom42 and @snipertyler's commands but in a USABLE form. . e.g. In your complicated shell script, put "ran 99" before a crucial component. Now, it will fail 1% of the time allowing you to test the failure code-path. $ ran 99 my_complex_program arg1 arg2

List the binaries installed by a Debian package
GNU grep's perl-compatible regular expression(PCRE).

finding cr-lf files aka dos files with ^M characters
its useful to run dos2unix command later on them.

Rename files in batch

Collect a lot of icons from /usr/share/icons (may overwrite some, and complain a bit)
In other way of xargs, only with find -exec


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