Show a line when a "column" matchs

awk '{ FS = OFS = "#" } { if ($9==1234) print }' filename*.log > bigfile.log

2
By: trunet
2009-02-09 18:26:25
awk

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  • The above is an example of grabbing only the first column. You can define the start and end points specifically by chacater position using the following command: while read l; do echo ${l:10:40}; done < three-column-list.txt > column-c10-c40.txt Of course, it doesn't have to be a column, or extraction, it can be replacement while read l; do echo ${l/foo/bar}; done < list-with-foo.txt > list-with-bar.txt Read more about parameter expansion here: http://wiki.bash-hackers.org/syntax/pe Think of this as an alternative to awk or sed for file operations


    1
    while read l; do echo ${l%% *}; done < three-column-list.txt > only-first-column.txt
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  • -P uses the POSIX output format, which makes information on each file system always printed on exactly one line. "column -t" makes a table from the input. Show Sample Output


    19
    df -P | column -t
    fossilet · 2011-04-09 13:12:46 5
  • There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?


    4
    cut -f 1 three-column.txt > first-column.txt
    postrational · 2010-07-11 10:13:45 1

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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