Commands tagged stdin (7)

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subtraction between lines
It's allways strange for me to see sed and awk in the same command line if you can avoid it

Join lines
Even shorter. Stolen from comment posted by eightmillion.

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"

Create a list of binary numbers
If you should happen to find yourself needing some binary numbers, this is a quickie way of doing it. If you need more digits, just add more "{0..1}" sequences for each digit you need. You can assign them to an array, too, and access them by their decimal equivalent for a quickie binary to decimal conversion (for larger values it's probably better to use another method). Note: this works in bash, ksh and zsh. For zsh, though, you'll need to issue a setopt KSH_ARRAYS to make the array zero-based. $ binary=({0..1}{0..1}{0..1}{0..1}) $ echo ${binary[9]}

send DD a signal to print its progress
every 1sec sends DD the USR1 signal which causes DD to print its progress.

attach to bash shell in the last container you started

Change host name
With sed you can replace strings on the fly.

find and delete empty directories recursively
this will show the names of the deleted directories, and will delete directories that only no files, only empty directories.

Execute a command at a given time

convert a,b,c to ('a','b','c') for use in SQL in-clauses


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