I'm a newbie in Linux. I was trying to make a nested if loop inside a for loop and found difficulties taking out the numeric values from a list. My code is
#!/bin/bash
t=`ls ListOfthings`
for i in $t
do
if "$i" -eq "$i"
then
echo hi (for example)
fi
done
when I execute this, it said syntax error unexpected token 'done'. I think its some problems related to the "$i" -eq "$i"
? Is this the right way to identify the numerical items?
For example, from a list [123 23 63 a.txt b.txt c.sh]
, 123
, 23
and 63
are needed.
Try using regex. For example: egrep '^[0-9]+$' list
Or if you're using ls: ls | egrep '^[0-9]+$'
ls | egrep '^[0-9]+$'
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