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Search for a string in files recursively in BusyBox 1.0?

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http://unix.stackexchange.com – How can I search for a string in a file recursively in BusyBox 1.0 if find and grep are not available ? (I want to telnet into the router and find out where the iptables rules are stored.) BusyBox v1.00 (2011.01.13-12:30+0000) Built-in shell (msh) Enter 'help' for a list of built-in commands. # help Built-in commands: ------------------- . : break cd continue eval exec exit export help login newgrp read readonly set shift times trap umask wait [ busybox cat chmod cp date dmesg echo expr false ftpget ftpput hostname ifconfig init insmod kill killall klogd li (HowTos)