Dealing Bash Syntax Errors

Question

I have my bash code.

#!/bin/bash

read message
echo $message | tr "A-Za-z" "N-ZA-Mn-za-m"
if [ $message == false ]; then
fi
done

It works but I get syntax errors after,

rot13.sh: line 6: syntax error near unexpected token `fi'
rot13.sh: line 6: `fi'

Now I don't expect a solution in this thread but I'm just wondering where should I go and that should I do when I get these errors? Is there any commands I can use in the compiler or documentation/checklists that check for syntax errors.

I am new to bash code so being able to check and understand there syntax error would help a lot.

Thank you.

Are you expecting your second line to modify the value of $message? (Spoiler: it doesn't.) — chepner
– chepner, Commented Mar 18, 2018 at 15:19

Gilles Quénot · Accepted Answer · 2018-03-18 22:49:02Z

2

#!/bin/bash

read message
echo "$message" | tr "A-Za-z" "N-ZA-Mn-za-m"
if [ "$message" = false ]; then
    echo 'false'
fi

You need something between then and fi.

Before asking human help, always test your code on http://www.shellcheck.net/ before

And if you need to store the output of the tr command :

message="$(echo "$message" | tr "A-Za-z" "N-ZA-Mn-za-m")"

Last thing, you have a lost done statement at the end of the script

edited Mar 18, 2018 at 22:49

answered Mar 18, 2018 at 15:15

Gilles Quénot

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2 Comments

trinaldi Over a year ago

A lot of questions would be self replied if people know about shellcheck.

user unknown Over a year ago

Yes, and the answers too; there is a trailing done in the script. :)

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