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Calling a bash function when in a find 

find . -name "*.xml" | while read i; do function "$i"; done

Checking for number of commandline arguments 

EXPECTED_ARGS=1
E_BADARGS=65
 
if [ $# -ne $EXPECTED_ARGS ]
then
  echo "Usage: `basename $0` {arg}"
  exit $E_BADARGS
fi

Reference: http://www.linuxweblog.com/bash-argument-numbers-check

Use of the bash conditional

Refer to http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html

Substring / String Length

Using build-in variables: 

LEN=${#FILE}
OLD_FILE=${FILE%.new}

Using expr (counts from 1, not from 0): 

LEN=`expr length $FILE`
CUTLEN=`expr $LEN - 5`
OLD_FILE=`expr substr $FILE 1 $CUTLEN`

Further reading about shell parameter expansion: http://www.delorie.com/gnu/docs/bash/bashref_29.html

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