Commands by robinsonaarond (13)

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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"

Batch rename extension of all files in a folder, in the example from .txt to .md

Probably, most frequent use of diff
This form is used in patches, svn, git etc. And I've created an alias for it: alias diff='diff -Naur --strip-trailing-cr' The latter option is especially useful, when somebody in team works in Windows; could be also used in commands like $ svn diff --diff-cmd 'diff --strip-trailing-cr'...

Display a block of text: multi-line grep with perl
-n reads input, line by line, in a loop sending to $_ Equivalent to while () { mycode } -e execute the following quoted string (i.e. do the following on the same line as the perl command) the elipses .. operator behaves like a range, remembering the state from line to line.

find xargs mv

Get absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

Fast file backup
This is a BASH feature. The above command will create a backup of "filename" called "filename.DATE", where DATE is the actual day in %Y%m%d (year, month and day numbers together) format.

Send a local file via email
if "mail -a" fail, try "mutt -a" or "nail -a"

find large files

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.


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