#!/usr/bin/env bash

# @(#) s1       Demonstrate delete lines with reference file, grep.

# 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" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C grep

FILE=${1-data1}
E=expected-output.txt

pl " Input data file and reference file data2:"
head data[12]

pl " Expected output:"
cat $E

pl " Results:"
grep -vf data2 data1 |
tee f1

pl " Verify results if possible:"
C=$HOME/bin/pass-fail
[ -f $C ] && $C || ( pe; pe " Results cannot be verified." ) >&2

exit 0

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.7 (jessie) 
bash GNU bash 4.3.30
grep (GNU grep) 2.20

-----
 Input data file and reference file data2:
==> data1 <==
1,XX
2,YY
3,ZZ
4,DD

==> data2 <==
2
3

-----
 Expected output:
1,XX
4,DD

-----
 Results:
1,XX
4,DD

-----
 Verify results if possible:

-----
 Comparison of 2 created lines with 2 lines of desired results:
 Succeeded -- files (computed) f1 and (standard) expected-output.txt have same content.