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Top Forums Shell Programming and Scripting awk match to update contents of file Post 302981036 by cmccabe on Tuesday 6th of September 2016 04:31:53 PM
Old 09-06-2016
awk match to update contents of file

I am trying to match $1 in file1 with $2 in file2. If a match is found then $3 and $4 of file2 are copied to file1. Both files are tab-delimeted and I am getting a syntax error and would also like to update file1 in-place without creating a new file, but am not sure how. Thank you Smilie.

file1
Code:
123
456
789
111
222
333
444
555

file2
Code:
...    789    yyy    xxx    zzz    11111
...    111    xxx    yyy    aaa    22222
...    222    zzz    xxx    yyy    33333

awk
Code:
awk -F'\t' 'NR==FNR{A[$1]=$2; next} $2 in A{$3=A[$3] $3 in A{$4=A[$4]}}1' file1 file2 > output
awk: cmd. line:1: NR==FNR{A[$1]=$2; next} $2 in A{$3=A[$3] $3 in A{$4=A[$4]}}1
awk: cmd. line:1:

desired output (file1 updated to)
Code:
...    789    yyy    xxx
...    111    xxx    yyy
...    222    zzz    xxx


Last edited by cmccabe; 09-06-2016 at 05:34 PM.. Reason: added error and fixed format
 

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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to cmp or diff. If only one file is specified, then the files compared are file1 (which must have a suffix of a supported com- pression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom- pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp or diff is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2009-07-05 XZDIFF(1)
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