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Full Discussion: Find line then evaluate text on next line, print when condition is met
Top Forums Shell Programming and Scripting Find line then evaluate text on next line, print when condition is met Post 303012694 by RudiC on Wednesday 7th of February 2018 02:47:20 PM
Old 02-07-2018
Quote:
Originally Posted by LMHmedchem
When changing to,

cat inputfile | awk 'F == 1 { if($0 ~ "InChI=") { print $0; F = 0 } } $0 ~ "<CompoundName>" { F = 1 } '

I get the same output running this as I do for F = 1. Do I have the braces wrong or something?
.
.
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Might be due to spurious F , mayhap set by a CompoundName way before. You should reset F after each line processed, like
Code:
awk 'F == 1 && /InChI=/; { F = 0 } $0 ~ "<CompoundName>" { F = 1 } ' file
InChI=1S/C5H12NO2/c1-5(2)4-8-6(3)7/h5H,4H2,1-3H3/q+1

Quote:
I am surprised to not see a grep solution. I always think of grep as a way to find and print text.
grep prints lines FOUND (plus context, that is); it CAN'T print the following line only... If your grep allows for the -A option, try
Code:
grep -A1 CompoundName file | grep InChI

(implying the InChI is not contained in the CompoundName lines)
Last edited by RudiC; 02-07-2018 at 03:54 PM..
 

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LEARN ABOUT HPUX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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