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Full Discussion: Append Files
Top Forums UNIX for Dummies Questions & Answers Append Files Post 302661821 by migurus on Monday 25th of June 2012 08:33:16 PM
Old 06-25-2012
One can use tail and head to get the last two lines from a file:

Code:
 
one_before_last=$( tail -2 my_input|head -1 )
the_last_line=$(tail -1 my_input)

To determine if the line is present one can use grep -q - it will return 1 if not found, which can be used with
Code:
||

construct

To put it together one can do something like this:

Code:
 
#!/bin/ksh
input_file_1="your-name-here"
input_file_2="yeor-name-here"
my_output_file="your-name-here"
F1N1=$(tail -2 $input_file_1|head -1)
F1N2=$(tail -1 $input_file_1)
F2N1=$(tail -2 $input_file_2|head -1)
F2N2=$(tail -1 $input_file_2)
grep -q "$F1N1" $my_output_file || echo "$F1N1" >> $my_output_file
grep -q "$F1N2" $my_output_file || echo "$F1N2" >> $my_output_file
grep -q "$F2N1" $my_output_file || echo "$F2N1" >> $my_output_file
grep -q "$F2N2" $my_output_file || echo "$F2N2" >> $my_output_file

Hope this will give you an idea.
 

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LEARN ABOUT X11R4

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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