====== Script ======

===== Commands =====

^  Command  ^  Function  ^
|  #!/bin/bash\\ or\\ #!/bin/sh  |  shebang  |
|  VAR=var  |  set VAR to var  |
|  $VAR  |  inserts var whereever $VAR is placed  |
|  case - esac  |  inserts case  |
|  if [ "var" == "var" ]; then fi  |  inserts if  |

==== if conditions ====

^  Operator  ^ Description  ^
|  -eq  |  Returns true if two numbers are equivalent  |
|  -lt  |  Returns true if a number is less than another number  |
|  -gt  |  Returns true if a number is greater than another number  |
|  ==  |  Returns true if two strings are equivalent  |
|  !=  |  Returns true if two strings are not equivalent  |
|  !  |  Returns true if the expression is false  |
|  -d  |  Check the existence of a directory  |
|  -e  |  Check the existence of a file  |
|  -r  |  Check the existence of a file and read permission  |
|  -w  |  Check the existence of a file and write permission  |
|  -x  |  Check the existence of a file and execute permission  |
|  -z  |  string is null, that is, has zero length  |
|  -n  |  string is not null.  |

https://tldp.org/LDP/abs/html/comparison-ops.html

===== Troubleshooting =====

==== Interpreter error ====

=== Problem: ===
Running your script prompts interpreter error\\

=== Fix: ===
Open your script with vi and execute the following
<code> :set fileformat=unix </code>

==== Not enough rights ====

=== Problem: ===
Running your script requires more rights

=== Fix: ===
Make your script executable with the following command
<code>chmod +x [scriptname].sh</code>
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~~DISCUSSION:closed~~