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==== Command substitution ====

Command substitution allows the output of one command to be used as arguments to another.

*<code>`</code>''command''<code>`</code> means take the output of ''command'', parse it into words and paste them back into the command line.

The following is an example of nested command substitutions with [[Leaning toothpick syndrome]]:

<syntaxhighlight lang="csh">
echo "`echo "\"\`"echo "\"\\\"\\\`\""echo "\"\\\"\\\\\\\"\\\\\\\`\\\"\""echo "\"\\\"\\\\\\\"\\\\\\\\\\\\\\\"\\\\\\\\\\\\\\\`\\\\\\\"\\\"\""echo "\"\\\"\\\\\\\"\\\\\\\\\\\\\\\"\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\"\\\\\\\"\\\"\""pwd"\"\\\"\\\\\\\"\\\\\\\\\\\\\\\"\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\"\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\"\\\\\\\"\\\\\\\`\\\\\\\"\\\"\\\`\\\"\"\`\""`"
</syntaxhighlight>