2个相同的字符串在bash中不相等

Question

I'm trying to test if the output of a program is equal to something, so that I can do something based on it. The console prints that the 2 values are equal, but the condition is not met.

Here's the code:

#!/bin/bash

test_id=`clasp run testRunner`

function get_logs() {
  echo "trying to get logs for test id $test_id..."

  logs=`clasp logs`

  if logs_contain_test_id
  then
    print_logs
  else
    get_logs
  fi
}

function logs_contain_test_id() {
  IFS=$' '
  for log in $logs
  do
    echo $log
    echo $test_id
    if [[ "$log" == "$test_id" ]]
    then
      return 0
    fi
  done
  return 1
}

get_logs

Note that this line echo "trying to get logs for test id $test_id..." only prints the id like "03443db8..." and not the full sentence.

Also the echo $log and echo $test_id log 03443db8 03443db8 on 2 separate lines so they should be equal.

How can I debug this? Seems like some hidden characters are part of $test_id

The condition print_logs never gets activated, even if both returns print equal to the console. I am on a mac if it makes any difference.

Here's the strange output I am getting:

tests,
03443db8
0
03443db8
failures,
03443db8
03443db8
03443db8
03443db8... <-- this should be "trying to get logs for test id 03443db8..."

edit: after adding set -x I get these logs:

+ [[ failures, == \[\2\K\[\1\G\4\4\f\a\7\0\c\7 ]]
+ for log in '$logs'
+ echo 44fa70c7
44fa70c7
44fa70c7'
44fa70c7
+ [[ 44fa70c7 == \[\2\K\[\1\G\4\4\f\a\7\0\c\7 ]]
+ return 1
+ get_logs
44fa70c7...'
44fa70c7...
++ clasp logs

Answer 1

Add set -x to your script then you can trace it. See Bash Manual: The Set Builtin for more details. In your case the script would be:

#!/bin/bash
set -x
test_id=`clasp run testRunner`

function get_logs() {
  set -x
  echo "trying to get logs for test id $test_id..."

  logs=`clasp logs`

  if logs_contain_test_id
  then
    print_logs
  else
    get_logs
  fi
}

function logs_contain_test_id() {
  set -x
  IFS=$' '
  for log in $logs
  do
    echo $log
    echo $test_id
    if [[ "$log" == "$test_id" ]]
    then
      return 0
    fi
  done
  return 1
}

get_logs