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copied!<p>The options for any command line are expanded before the command is run, even for internal commands. Whatever shell you're using to run <code>/bin/bash cd ~</code> is presumably interpreting the tilde literally rather than a special character that expands to your home directory.</p> <p>As a test, try creating a directory by that name and see if the error goes away.</p> <pre><code>> mkdir ./~ > /bin/bash cd ~ </code></pre> <p>Note that the <code>cd</code> command needs to be done <em>within your running shell</em> to be useful. When you change the working directory of a sub-shell, and then the sub-shell exits, you'll find yourself back where you started.</p> <p><strong>UPDATE</strong>:</p> <p>From within a bash script, you should be able to use the <code>$HOME</code> environment variable, which should consistently contain your home directory. I'm not aware what conditions would cause tilde expansion to fail, but I've always used <code>$HOME</code>.</p> <p>Also, when determining whether you can change into a particular directory, you have the option of being explicit and returning useful status:</p> <pre><code>unset err if [[ ! -d "$somedir" ]]; then err="Can't find $somedir" elif [[ ! -r "$somedir" ]]; then err="Can't read $somedir" fi if [[ -n "$err" ]]; then echo "$ERROR: $err" >&2 exit 1 fi cd "$somedir" </code></pre> <p>Or, you can just try the CD and look at its results.</p> <pre><code>if ! cd "$somedir"; then echo "ERROR: $somedir not availble" exit 1 fi </code></pre> <p>Detailed error reports are handy, but if you don't need them, keeping your code small has advantages as well.</p>

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