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Full Discussion: Compare two files line by line in bash
Top Forums UNIX for Beginners Questions & Answers Compare two files line by line in bash Post 303035737 by drl on Saturday 1st of June 2019 08:10:17 AM
Old 06-01-2019
Hi.

We can push the (implicit) loop down into a standard command and feed it with pairs of strings from the two files. So the core of this solution is paste -> xargs, the remainder of the demonstration script is setup and reporting:
Code:
#!/usr/bin/env bash

# @(#) s3       Demonstrate rename of files, xargs, mv.

# 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 paste xargs mv

pl " Input data file data?"
head data?

pl " Situation before rename:"
ls a* b*

pl " Results:"
paste data1 data2 | xargs -n 2 mv

pl " Situation after rename, expecting a2 b1 b2 b3:"
ls a* b*

exit 0

producing:
Code:
$ ./s3

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-7-amd64, x86_64
Distribution        : Debian 8.11 (jessie) 
bash GNU bash 4.3.30
paste (GNU coreutils) 8.23
xargs (GNU findutils) 4.4.2
mv (GNU coreutils) 8.23

-----
 Input data file data?
==> data1 <==
a1
b2
a3
a4

==> data2 <==
b1
b2
b3
b4

-----
 Situation before rename:
a1  a2  a3  b2

-----
 Results:
mv: 'b2' and 'b2' are the same file
mv: cannot stat 'a4': No such file or directory

-----
 Situation after rename, expecting a2 b1 b2 b3:
a2  b1  b2  b3

Best wishes ... cheers, drl
 

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LEARN ABOUT PLAN9

paste

PASTE(1)                                                           User Commands                                                          PASTE(1)

NAME

       paste - merge lines of files

SYNOPSIS

       paste [OPTION]... [FILE]...

DESCRIPTION

       Write lines consisting of the sequentially corresponding lines from each FILE, separated by TABs, to standard output.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -d, --delimiters=LIST
              reuse characters from LIST instead of TABs

       -s, --serial
              paste one file at a time instead of in parallel

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

AUTHOR

       Written by David M. Ihnat and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report paste translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/paste>
       or available locally via: info '(coreutils) paste invocation'

GNU coreutils 8.28                                                 January 2018                                                           PASTE(1)
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