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Top Forums Shell Programming and Scripting Simple awk command to compare two files and print first difference Post 302996497 by Scrutinizer on Wednesday 26th of April 2017 06:30:28 PM
Old 04-26-2017
@OP, you second suggestion seems to work alright but you forgot the second quote:
Code:
awk ' NR==FNR { a[NR]=$0; next } $0 != a[FNR] { print a[FNR]; exit }' file1 file2

However, it would read the whole of file1 first and put it in memory..

Another approach you could try:
Code:
awk '{getline s<f} $0!=s{print; exit}' f=file2 file1

This User Gave Thanks to Scrutinizer For This Post:
 

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PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ... ] [ file ... ] DESCRIPTION
Pr produces a printed listing of one or more files on its standard output. The output is separated into pages headed by a date, the name of the file or a specified header, and the page number. With no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -b Balance columns on last page, in case of multi-column output. -d Double space. -en Set the tab stops for input text every n spaces. -h Take the next argument as a page header (file by default). -in Replace sequences of blanks in the output by tabs, using tab stops set every n spaces. -f Use formfeeds to separate pages. -ln Take the length of the page to be n lines instead of the default 66. -m Print all files simultaneously, each in one column. -n Number the lines of each file. -on Offset the left margin n character positions. -sc Separate columns by the single character c instead of aligning them with white space. A missing c is taken to be a tab. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -wn For multi-column output, take the width of the page to be n characters instead of the default 72. SOURCE
/sys/src/cmd/pr.c SEE ALSO
cat(1), lp(1) PR(1)
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