Perl POD checking modules

A list:

• Test::Pod
• Pod::Checker

SSH tunnel

ssh -N -R 5555:1.2.3.4:666 user@hostname

• 5555 is a port you make up
• 666 is the port to which you are forwarding
• 1.2.3.4 is the IP of the target host to which you are fowarding
• hostname is the host where port 5555 will be made available
• you run this command on a third machine (e.g. your local host)

This results in  hostname:5555  getting forwarded to  1.2.3.4:666

Useful bash flags for scripts verbose trace expand error exit

Useful flags:
set -v # "verbose" - echo commands

set -x # "xtrace" - like verbose but expands commands

set -e # "errexit" - abort script at first error

set -u # "nounset" - strict mode: undefined variable causes an exit

Long format:

set -o verbose

Bash "strict mode":
#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

(source, source)

Windows: folder or file open in another program

When you try to move a folder:

    "The action can't be completed because the folder or a file in it is open in another program"

This stunningly unhelpful error message has persisted through many versions of Windows.

The way I work around it is:

• Rename an unrelated file or folder nearby, then rename it back again.
• The original folder or file should now be "unlocked"

You can always reboot to fix it, too.

Ctrl-C doesn't interrupt loop in Bash script

If you want Ctrl-C to be able to stop your loop in Bash, put this inside the loop:

trap "echo Exited!; exit;" SIGINT SIGTERM

(source)