I used to write a lot of shell scripts before realising that what I was trying to do was treat shell scripting as a "full" scripting language (I won't define here what I mean by "full").
Its not - reach for a higher level scripting language like Ruby or Python when things are getting more complicated, and allow shell scripts to glue things together, or be for quick tasks maybe a few lines long.
When you do write them, this advice is great but it's definitely worth gaining understanding of when you should and shouldn't use them.
by 
Jamie Tanna
.
#command-line
#shell
#bash.
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