Deleting blank spaces from files. I used it along with my scripts to configure the rsyslog server. I was provided with a jumbled list of more than hundred network switches.

RemoveSpace

#!/bin/bash

#To delete all whitespace: cat file.txt | tr -d "[:space:]"
#To delete all horizontal whitespace: cat file.txt | tr -d "[:blank:]"
#Using LibreOffice calc in the final stage I had two columns to merge. Eg:
/var/log/Switches/  Switch1
/var/log/Switches/  Switch2
.                    .
.                    .
.                    .
.                    .
.                    .

#So I did:
cat filename | tr -d "[:blank:]"