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POIn Ubuntu Bash, how do I compare a variable to a stdout value?
 

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  1. POIn Ubuntu Bash, how do I compare a variable to a stdout value?
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    <blockquote> <p>I attempted to follow the answer on <a href="https://stackoverflow.com/questions/4277665/bash-how-do-i-compare-two-string-variables-in-an-if-statement">How do I compare two string variables in an &#39;if&#39; statement in Bash?</a>, but the accepted solution did not work. As you can see from the script below, my syntax follows the solutions on that question which gives me the error found here <a href="https://stackoverflow.com/questions/3401183/bash-syntax-error-not-found">Bash syntax error: &quot;[[: not found&quot;</a>. And yes, I tried their solution too.</p> </blockquote> <p>I have the following script where I am trying to delete all data from a directory. Before I delete all data, I want to compare a variable to a stdout value to verify I have the correct directory.</p> <p>To avoid deleting all data from the wrong directory, I am attempting to compare the variable in the script with data stored in a *.ini.php file.</p> <p>Here is the script:</p> <pre><code> #!/bin/bash #--- script variables --- #base path of the timetrex web folder ending with a / character timetrex_path=/var/www/timetrex/ timetrex_cache=/tmp/timetrex/ #--- initialize script--- #location of the base path of the current version ttrexVer_path=$(ls -d ${timetrex_path}*.*.*)/ #the timetrex cache folder ttrexCache_path=$(sed -n 's/[cache]*dir =*\([^ ]*\)/\1/p' &lt; ${ttrexVer_path}timetrex.ini.php)/ echo $timetrex_cache echo $ttrexCache_path #clear the timetrex cache if [[ "$ttrexCache_path" = "$timetrex_cache" ]] then #path is valid, OK to do mass delete #rm -R $ttrexCache_path* echo "Success: TimeTrex cache has been cleared." else #path could be root - don't delete the whole server echo "Error: TimeTrex cache was NOT cleared." fi </code></pre> <p>The output of the script shows the following:</p> <pre><code>/tmp/timetrex/ /tmp/timetrex/ Error: Timetrex cache was NOT cleared. </code></pre> <p><strong>As you can see from the output, both values are the same. However, when the script compares the two variables, it thinks they are different values.</strong></p> <p>Is this because the values are different types? Am I using the wrong comparison operator in the <strong>if statement</strong>? Thanks in advance.</p>
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    1. COTry changing your second echo to `echo "|$ttrexCache_path|"`. I'll bet there's some whitespace in there.
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    2. CO@fotanus The problem in that question was incorrect syntax in the `if` statement, this question doesn't have that problem.
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    3. COThanks @Bamar, unfortunately adding pipes to the beginning and end of the variables gives the message `/tmp/timetrex/: Is a directory` for both variables.
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