scripts/foreachfile at master · camuso/scripts · GitHub

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#!/bin/bash
#
# foreachfile
#

# filename placeholder token to be used from the command line and for
# substitution in the individual commands
#
token="%"

usagestr=$(
cat <<EOF

foreachfile filespec body

filespec - file specification, can have wildcards

body	 - body of the loop

Both filespec and body must be enclosed in double quotes.
In the body of the loop, the current file is denoted by
this token: '$token'

Use  \\  to escape  \\ , %, $, etc.

Example:
	foreachfile "*.patch" "echo $token; grep -m1 'Subject' $token"
\0
EOF
)

usage() {
	echo -e "$usagestr"
	exit
}

# parse_cmd
#
# If the command contains the token, then replace it with the current filename
# and execute the command.
#
# $1 - current filename
# $2 - command
#
parse_cmd() {
	local file="$1"		# get the name of the current file
	shift			# shift past the filename
	local cmd="$@"		# remainder of command line is command string
	local ary=($cmd)	# create an array from the command string
	local index=0		# index for the array

	for index in "${!ary[@]}"; do
		[[ ${ary[$index]} == "$token" ]] && ary[$index]="$file"
	done

	echo "${ary[@]}" >> /tmp/cmd
}


[ $# -gt 0 ] || usage

# shopt -s extglob

declare filespec="$1"		 # file specification including wildcards
declare files=$(ls -1 $filespec)	# list of files
echo -e \
	" List of Files\n"\
	"============="
echo "$files"

shift				# shift past the file specification
declare body="$@"		# remainder of command line is loop body
declare cmdary			# array of commands to be executed in loop

# Create a dummy script file to execute the commands
#
touch /tmp/cmd
chmod +x /tmp/cmd

# Tokenize the loop body into an array using ';' as the IFS separator.
#
IFS=";" read -ra cmdary <<<"$body"

echo -e \
	"\n List of Commands\n"\
	  "================"
for key in "${!cmdary[@]}"; do echo $key ${cmdary[$key]}; done

# For each for the files in the list, execute the body of commands
#
for f in $files; do

	> /tmp/cmd

	# Substitute the token with the file name in each command that has
	# a token and write the command line out to the /tmp/cmd file.
	#
	for key in "${!cmdary[@]}"; do
		parse_cmd $f "${cmdary[$key]}"
	done

	# Execute the commands
	#
	/tmp/cmd
done

# Delete the dummy script file
#
rm -f /tmp/cmd