|Advanced Bash-Scripting Guide: A complete guide to shell scripting, using Bash|
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Can a script recursively call itself? Indeed.
Example 34-6. A script that recursively calls itself
#!/bin/bash # recurse.sh # Can a script recursively call itself? # Yes, but this is of little or no practical use #+ except perhaps as a "proof of concept". RANGE=10 MAXVAL=9 i=$RANDOM let "i %= $RANGE" # Generate a random number between 0 and $MAXVAL. if [ "$i" -lt "$MAXVAL" ] then echo "i = $i" ./$0 # Script recursively spawns a new instance of itself. fi # Each child script does the same, until #+ a generated $i equals $MAXVAL. # Using a "while" loop instead of an "if/then" test causes problems. # Exercise for the reader: Explain why. exit 0
Too many levels of recursion can exhaust the script's stack space, causing a segfault.