Programming

#!/usr/bin/env bash

# @(#) s1	Demonstrate searching binary file.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C strings head grep

FILE=${1-$(which cut)}

pl " Input data file $FILE is type $(file $FILE)"

pl " Results, strings -- $(wc -l < $FILE) strings found." 

pl " Results, strings and first 2 occurrences:"
strings $FILE |
head -2 

pl " Results, strings and grep searching for \"bucket\""
strings $FILE |
grep bucket

pl " Results, grep, (expect only a message):"
grep bucket $FILE

pl " Results, grep, every occurrence:"
grep -a bucket $FILE

pl " Results, grep, only first 2 results:"
grep -a -m 2 bucket $FILE

exit 0

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
strings GNU strings (GNU Binutils for Debian) 2.18.0.20080103
head (GNU coreutils) 6.10
grep GNU grep 2.5.3

-----
 Input data file /usr/bin/cut is type /usr/bin/cut: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped

-----
 Results, strings -- 130 strings found.

-----
 Results, strings and first 2 occurrences:
/lib64/ld-linux-x86-64.so.2
__gmon_start__

-----
 Results, strings and grep searching for "bucket"
# buckets:         %lu
max bucket length: %lu
# buckets used:    %lu (%.2f%%)

-----
 Results, grep, (expect only a message):
Binary file /usr/bin/cut matches

-----
 Results, grep, every occurrence:
# buckets:         %lu
max bucket length: %lu
# buckets used:    %lu (%.2f%%)

-----
 Results, grep, only first 2 results:
# buckets:         %lu
max bucket length: %lu

head -c 32m | grep $STRING

dd if=file count=x | grep "string"