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    <h3>Two ansers: The compatible <a href="/questions/tagged/shell" class="post-tag" title="show questions tagged 'shell'" rel="tag">shell</a> and the pure <a href="/questions/tagged/bash" class="post-tag" title="show questions tagged 'bash'" rel="tag">bash</a>:</h3> <p><em><strong>Last edit:</em></strong> Make regexp more precise and correct some counting bugs.</p> <p>Something like:</p> <pre><code>create_folder() { if [ -e "$1" ] ;then counter=1; while [ -e "$1-$counter" ] ;do counter=$((counter+1)) done mkdir "$1-$counter"; else mkdir "$1"; fi; } </code></pre> <p>could do:</p> <pre><code>$ ls -ltr /tmp |grep foo $ create_folder /tmp/foo\ bar $ create_folder /tmp/foo\ bar $ create_folder /tmp/foo\ bar $ ls -ltr /tmp |grep foo drwxr-xr-x 2 user user 4096 1 mai 10:53 foo bar drwxr-xr-x 2 user user 4096 1 mai 10:53 foo bar-1 drwxr-xr-x 2 user user 4096 1 mai 10:53 foo bar-2 </code></pre> <p>or with a better formatting and another way of counting (quicker if many directories exists as it use specialized count function, but longer if else because of forks.):</p> <pre><code>create_folder() { if [ -e "$1" ] ;then counter=`/bin/ls -1 "$1" "$1-"* 2&gt;&amp;1 | grep -E "^$1(-[0-9]*)?" | wc -l`; nname="`printf "%s-%04d" "$1" $counter`"; mkdir "$nname"; else mkdir "$1"; fi; } </code></pre> <p>This was tested under different <a href="/questions/tagged/shell" class="post-tag" title="show questions tagged 'shell'" rel="tag">shell</a> implementations: <a href="/questions/tagged/bash" class="post-tag" title="show questions tagged 'bash'" rel="tag">bash</a>, <a href="/questions/tagged/dash" class="post-tag" title="show questions tagged 'dash'" rel="tag">dash</a>, <a href="/questions/tagged/ash" class="post-tag" title="show questions tagged 'ash'" rel="tag">ash</a> and <a href="/questions/tagged/ksh" class="post-tag" title="show questions tagged 'ksh'" rel="tag">ksh</a></p> <pre><code>$ create_folder /tmp/test $ ls -ltr /tmp/| grep test drwxr-xr-x 2 user user 4096 Apr 30 13:25 test $ create_folder /tmp/test $ create_folder /tmp/test $ ls -ltr /tmp/| grep test drwxr-xr-x 2 user user 4096 Apr 30 13:25 test drwxr-xr-x 2 user user 4096 Apr 30 13:26 test-0001 drwxr-xr-x 2 user user 4096 Apr 30 13:26 test-0002 </code></pre> <p>And with dirname containing whitespaces:</p> <pre><code>$ create_folder "foo bar" $ create_folder "foo bar" $ create_folder "foo bar" $ create_folder "foo bar" $ ls -ltr | grep foo drwxr-xr-x 2 user user 4096 Apr 30 13:35 foo bar drwxr-xr-x 2 user user 4096 Apr 30 13:35 foo bar-0001 drwxr-xr-x 2 user user 4096 Apr 30 13:35 foo bar-0002 drwxr-xr-x 2 user user 4096 Apr 30 13:35 foo bar-0003 </code></pre> <h3>And for <a href="/questions/tagged/bash" class="post-tag" title="show questions tagged 'bash'" rel="tag">bash</a> fans:</h3> <pre><code>create_folder() { local -a list local counter nname if [ -e "$1" ] ;then list=("$1-"*) list=(${list[@]// /_}) list=(${list[@]//*\*}) counter=$((${#list[@]}+1)) printf -v nname "%s-%04d" "$1" $counter mkdir "$nname"; else mkdir "$1"; fi; } </code></pre> <p>Very quick, no fork and nice formatting:</p> <pre><code>$ create_folder "/tmp/foo bar" $ create_folder "/tmp/foo bar" $ create_folder "/tmp/foo bar" $ create_folder "/tmp/foo bar" $ ls -ltr /tmp/ | tail -n 4 drwxr-xr-x 2 user user 4096 1 mai 11:17 foo bar drwxr-xr-x 2 user user 4096 1 mai 11:17 foo bar-0001 drwxr-xr-x 2 user user 4096 1 mai 11:17 foo bar-0002 drwxr-xr-x 2 user user 4096 1 mai 11:17 foo bar-0003 </code></pre>
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    1. POCreating directories with increasing name using mkdir
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    1. CONono, [don't parse the output of ls](http://mywiki.wooledge.org/ParsingLs). That aside, try running `create_folder "foo bar"` two and three times and see what else is wrong with your code.
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    2. CO@AdrianFrühwirth Ok, I've missed one double quote: `printf "%s-%04d" "$1"`. The main advantage of this instead of *pure bash*, is that work under busybox, as well.
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    3. CO@AdrianFrühwirth As there is a `grep` between `ls` and `wc -l`, the *don't parse ls output* does not matter here, but thanks anyway.
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