Short Scripts and one-liners

Collection of useful short scripts

Rename multiple folders using powershell

• Innumerate though the file type you want to rename
• Pipe the result to Rename-Item Rename the files with a suffix () and add a 4 digit tag

example:

$i = 1
Get-ChildItem *.jpg | %{Rename-Item $_ -NewName ('1000100_{0:D4}.jpg' -f $i++)}

Alternative way to schedule command

• An alternative to using cron. This method allows a one-off task to be scheduled for a certain time.

example:

echo "ls -l" | at midnight

Mound folder with sshfs

• Mount a folder or filesystem using SSH

example:

sshfs name@server:/path/to/folder /path/to/mount/point

• Add a prifix in to filenames bulk

example:

rename 's/^/prefix/' *

• Set an audible alarm when a IP comes online - realy works

example:

ping -i 60 -a IP_address

• List active connections and the number using NETSTAT - Linux only

example:

netstat -ntu |  awk '{print $5}' |  cut -d: -f1 |  sort |  uniq -c |  sort -n

• Remove all but a certain file (in a directory)

example:

rm -f !(dontremove_filename.txt)

• List apps that are connected to the intenet at the moment

example:

 lsof -P -i -n |  cut -f 1 -d " "|  uniq |  tail -n +2

• Convert uppercase files to lowercase files - bulk

example:

 rename 'y/A-Z/a-z/' *

• Quick and live ssh network throughput test. Might need to install PV

example:

 pv /dev/zero|ssh $host 'cat > /dev/null'

• All IPS connected to the current machine

example:

 netstat -lantp |  grep ESTABLISHED | awk '{print $5}' |  awk -F: '{print $1}' |  sort -u

• Copy a file with progress bar and save hash to a seperate file (You can add this to a loop for multiple files). Might need to install PV

example:

pv file.iso | tee >(sha1sum > file.sha1) > file-copy.txt

• Create requirement.txt file on a python venv

example:

pip3 freeze > requirements.txt