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Top Forums Shell Programming and Scripting Simple awk command to compare two files and print first difference Post 302996494 by LMHmedchem on Wednesday 26th of April 2017 06:11:59 PM
Old 04-26-2017
Quote:
Originally Posted by RudiC
How about
Code:
diff -y -b --suppress-common-lines file1 file2 | cut -f1 | head -1
123476854


Or, slightly adapting your own awk proposal:
Code:
awk ' NR==FNR { a[$0]; next } !($0 in a){ print $1; exit } ' file2 file1
123476854

It seems something like this would be correct,

awk ' NR==FNR { a[$0]; next } $0 != a[FNR] { print a[FNR]; exit } file1 file2'

but that doesn't do anything at all. Am I right that evaluating !($0 in a) looks for $0 anywhere in a[]? I am checking that the files match, so it matters that the value appears on the same line in both files, not that it appears anywhere.

LMHmedchem
 

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CUT-DIFF(1)							  Cutter's manual						       CUT-DIFF(1)

NAME
cut-diff - show difference between 2 files with color SYNOPSIS
cut-diff [option ...] file1 file2 DESCRIPTION
cut-diff is a diff command that uses diff feature in Cutter. It shows difference with color. It's recommended that you use a normal diff(1) when you want to use with patch(1) or you don't need color. OPTIONS
--version cut-diff shows its own version and exits. -c [yes|true|no|false|auto], --color=[yes|true|no|false|auto] If 'yes' or 'true' is specified, cut-diff uses colorized output by escape sequence. If 'no' or 'false' is specified, cut-diff never use colorized output. If 'auto' or the option is omitted, cut-diff uses colorized output if available. The default is auto. -u, --unified cut-diff uses unified diff format. --context-lines=LINES Shows diff context around LINES. All lines are shown by default. When unified diff format is used, 3 lines are shown by default. --label=LABEL, -L=LABEL Uses LABEL as a header label. The first--label option value is used as file1's label and the second --label option value is used asfile2's label. Labels are the same as file names by default. EXIT STATUS
The exit status is 0 for success, non-0 otherwise. TODO: 0 for non-difference, 1 for difference and non-0 for errors. EXAMPLE
In the following example, cut-diff shows difference between file1 and file2: % cut-diff file1 file2 In the following example, cut-diff shows difference between file1 and file2 with unified diff format: % cut-diff -u file1 file2 SEE ALSO
diff(1) Cutter February 2011 CUT-DIFF(1)
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