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Full Discussion: Select only the last line from the pattern
Top Forums Shell Programming and Scripting Select only the last line from the pattern Post 302682121 by RudiC on Sunday 5th of August 2012 03:28:16 PM
Old 08-05-2012
Quote:
Originally Posted by bakunin
This definitely works, but i suspect the printing routine to give formatted output. If the number of blanks varies because, for instance, a two-digit value has one leading space more than a 3-digit value ("-234" vs " -23" - don't know if they are possible at all) your line might fail. I suggest a slight modification therefore (replace "<spc>" by a blank and "<tab>" by a literal tab character):
...
bakunin
@bakunin: You're absolutely right re. the unreliable number of spaces (e.g. one would ecpect the energies to be in field 6 rather than -f8 for cut). I kept it on the simple side, your sed proposal is much safer here (would be field 6 then, btw).

@hmartine1983: as you obviously only want entire lines, try this (shamelessly borrowing aashish.sharma8's proposals):
output 1:
Code:
grep "E(" 6dialkene.out |tail -1
 SCF Done:  E(RB3LYP) =  -234.626900695     A.U. after    7 cycles

output 2:
Code:
grep "E(" 6dialkene.out |tail -3|head -2
 SCF Done:  E(RB3LYP) =  -234.626899214     A.U. after    8 cycles
 SCF Done:  E(RB3LYP) =  -234.626900474     A.U. after    8 cycles

output 3:
Code:
grep -A20 "Input orientation" 6dialkene.out |tail -16

will result in the 16 lines requested.
These rely heavily on data structures being fixed as shown in your example; any deviation might need more sophisticated analysis in the way bakunin pointed out.
Last edited by RudiC; 08-05-2012 at 04:40 PM..
 

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LEARN ABOUT XFREE86

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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