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#!/bin/bash
# script-detector.sh: Detects scripts within a directory.
TESTCHARS=2 # Test first 2 characters.
SHABANG='#!' # Scripts begin with a "sha-bang."
for file in * # Traverse all the files in current directory.
do
if [[ `head -c$TESTCHARS "$file"` = "$SHABANG" ]]
# head -c2 #!
# The '-c' option to "head" outputs a specified
#+ number of characters, rather than lines (the default).
then
echo "File \"$file\" is a script."
else
echo "File \"$file\" is *not* a script."
fi
done
exit 0
# Exercises:
# ---------
# 1) Modify this script to take as an optional argument
#+ the directory to scan for scripts
#+ (rather than just the current working directory).
#
# 2) As it stands, this script gives "false positives" for
#+ Perl, awk, and other scripting language scripts.
# Correct this.
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