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Top Forums UNIX for Dummies Questions & Answers Grep file and print value only if the following line doesnt contain value xxxx Post 302930920 by RudiC on Thursday 8th of January 2015 02:28:12 PM
Old 01-08-2015
awk reads and processes every single line in the input stream. A line starting with NE : is stored in the variable P, overwriting the last one, then that line's processing is abandoned and the next is read/processed. If it doesn't start with NE : P is printed, representing the last line.
BTW, I found a flaw in above: If there's multiple non-NE lines, P is printed several times. This should avoid it:
Code:
awk '/^NE :/ {P=$0; next} P {print P; P=""}' file
NE : V0004
NE : V00005

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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