I've been trying to write a bash script. A part of it is supposed to replace a part of a string with nothing.
Here's what I'm trying to do
$dbname=$1
$dbNameActual="${$dbname/.sql/}"
date
echo $dbNameActual
I tried a number of suggestions from stack. But got nowhere. I tried adding sed, but that didn't seem to work.
The idea is that I have a script, and it takes in a db import file name, say db250317.sql and outputs db250317 .
I'm running Ubuntu 16.04 LTS.
You don't put $ twice in the expression, and you don't put $ before the variable you're assigning to (this isn't PHP or Perl). It should be:
dbNameActual="${dbname/.sql/}"
Also, if the thing you're trying to delete is always at the end, you can use % to remove it:
dbNameActual="${dbname%.sql}"
Also remember to quote the variable when you use it later, in case the filename contains spaces. You should almost always quote variables, unless you have a specific reason not to.
echo "$dbNameActual" (unless you specifically require the shell to perform whitespace tokenization and wildcard expansion on the value; see stackoverflow.com/questions/10067266/…)