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Full Discussion: How to replace first line of every file using awk
Top Forums Shell Programming and Scripting How to replace first line of every file using awk Post 302876759 by Akshay Hegde on Tuesday 26th of November 2013 12:52:13 PM
Old 11-26-2013
How about this ?

Generate some files for test
Code:
$ awk 'BEGIN{for(i=1;i<=5;i++)for(j=1;j<=5;j++)print j >"file"i".tmp"}'
$ ls file*.tmp -1
file1.tmp
file2.tmp
file3.tmp
file4.tmp
file5.tmp

BEFORE
Code:
$ awk '{ print FNR==1 && NR!=1 || NR==1 ? $0 FS FILENAME : $0 }' file*.tmp
1 file1.tmp
2
3
4
5
1 file2.tmp
2
3
4
5
1 file3.tmp
2
3
4
5
1 file4.tmp
2
3
4
5
1 file5.tmp
2
3
4
5

Code:
awk '

function write_2_og_file(file){
                                 system(sprintf("%s %s %s","cat","tmpfile>",file))
                              }

     NR==1 || NR!=1 && FNR==1{
                                  w  = "tmpfile"
                                  close(w)
                                  $0 = replace
                                  f = FILENAME
                             }
              NR!=1 && FNR==1{
                                  write_2_og_file(p)
                             }
                             {
                                  print $0 >w
                                  p=f
                             }
                          END{
                                  close(w)
                                  write_2_og_file(p)
                                  system("rm tmpfile")
                             }
    '   replace="<m200" file*.tmp

AFTER
Code:
$ awk '{ print FNR==1 && NR!=1 || NR==1 ? $0 FS FILENAME : $0 }' file*.tmp
<m200 file1.tmp
2
3
4
5
<m200 file2.tmp
2
3
4
5
<m200 file3.tmp
2
3
4
5
<m200 file4.tmp
2
3
4
5
<m200 file5.tmp
2
3
4
5

Let me know if I missed anything...
 

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LEARN ABOUT SUSE

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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