Table of Contents
Count lines in file
wc -l laravel.log 169613 laravel.log
Word count lines in Laravel.log
Truncate lines from the beginning of a file
tail -n +169000 laravel.log > laravel2.log wc -l laravel2.log 614 laravel2.log
If statements
https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php
Example If Then Else Statement
#!/bin/bash if [ $BACKUP_STATUS = 1 ] ; then result="success" else result="failed" fi wget -q "https://backup-manager.test/api/job?api_token=xyz&id=1&status=$result"
How to Output the Date
https://www.shell-tips.com/linux/how-to-format-date-and-time-in-linux-macos-and-bash/
Calculate time differences
https://stackoverflow.com/questions/8903239/how-to-calculate-time-elapsed-in-bash-script
Source a file in the same directory
https://unix.stackexchange.com/questions/17717/refer-to-a-file-under-the-same-directory-of-a-script-found-in-path
Truthy / falsy (boolean) values
https://stackoverflow.com/questions/2953646/how-can-i-declare-and-use-boolean-variables-in-a-shell-script
Can you nest if statements in Bash?
4 Bash If Statement Examples ( If then fi, If then else fi, If elif else fi, Nested if )
Typical error:
line 44: [: =: unary operator expected
how to see in bash if a variable is set
https://www.cyberciti.biz/faq/see-check-if-bash-variable-defined-in-script-on-linux-unix-macos/
Output hostname in Bash
$HOSTNAME
How to concat variable in Bash
https://stackoverflow.com/questions/4181703/how-to-concatenate-string-variables-in-bash
A Bash function with variables
#!/bin/bash
greeting () {
echo "Hello $1"
}
greeting "Joe"
That was fun!