grep and integer expression expected

Question

I have just lost my mind. I code in Windows, now i have to make one tiny plug-in in Linux, to get communicated with my main code. I make code in bash, and on Windows, everything will be ok, but here, on Debian... I have spend 2 days to figure out what is going on, and tried almost everything.

It is my code :

#!/bin/bash 
search1=`cat /home/qlik/skrypty/windows/kody.txt | grep -E '[0-2]'`
case $search1 in
[|1|])
echo "Error, need restart"
exit 2
;;
case $search1 in
[|2|])
echo "Warning with server process, waiting"
exit 1
;;
*)
echo "OK"
exit 0
;;
esac

I have also tried that way

#!/bin/bash
plik1='/home/qlik/skrypty/windows/kody.txt'
szukaj1=$( grep 1 $plik )
szukaj2=$( grep 2 $plik )
if [ $($szukaj1) -eq "1" ] ; then
echo "Error, need restart"
exit 2
elif [ $($szukaj2) -eq "2" ] ; then
echo "Server process warning, waiting"
exit 1
else
echo "OK"
exit 0
fi

and all kinds of different ways. All the time I've got an errors :

integer expression expected

or

binary operator expected

or

[: -eq: unary operator expected

I have read about that, i think the problem is with symbols $(...)/[...]/.../'...'/[[...]]/$($...)/"..." and I really, really don't know what to do with my code, i tried almost all configurations.

The code is simple -

• it read file.txt

• in file.txt there are 4 numbers [for example : 0 0 2 0 ]

• if all are 0, then is ok,

• if one of them is 1, then is error

• if one of them is 2, then is information that process failed.

• when 1 or 2 are met, the exit code should be the same as error in txt

I just need to recognize what number is in file.txt and show different information and exit code.

Could You please help me?

Answer 1

Try:

#!/bin/bash

plik1='/home/qlik/skrypty/windows/kody.txt'

if grep -q -- 1 "$plik1" ; then
    echo "Error, need restart"
    exit 2
elif grep -q -- 2 "$plik1" ; then
    echo "Server process warning, waiting"
    exit 1
else
    echo "OK"
    exit 0
fi

It's based on the second code example in the question, but the szukaj variables have been removed because they aren't necessary (and they were being used incorrectly).