Shell Programming and Scripting

echo "test" | awk '{ cmd="date"; cmd|getline; print }'
Tue Sep 20 08:27:11 IST 2011

#!/bin/sh
nawk 'BEGIN\
{
 fileA = ARGV[1]
 fileB = ARGV[2]
}\
NR==FNR\
{
  a[++i]=$0;next
}
{
  b[++j]=$0;
}
END\
{
  for(k=1;k<=j;k++)
    { 
       print a[k] b[k] 
    }
}' $fileA $fileB

#!/bin/sh

fileA=$1
fileB=$2

awk '{...}' $fileA $fileB

awk '{... system(a[k]" "b[k]) ...}'

root@bt:/tmp/test# echo 123 | awk '{a="echo"; b="123"; system(a" "b" >/tmp/c")}'

root@bt:/tmp/test# cat /tmp/c
123

merge4.sh file1 file2


Quote:

    
    
merge4.sh: fileA: not found
merge4.sh: fileB: not found
    

#!/bin/sh
fileA = $1
fileB = $2
nawk 'NR==FNR\
{
  a[++i]=$0;next
}
{
  b[++j]=$0;
}
END\
{
  for(k=1;k<=j;k++)
    {
       print "\n======== " a[k] " ========"   
    }
}' $fileA $fileB

...
fileA=$1
fileB=$2
...

merge2.sh file1 file2

#!/bin/sh
nawk 'BEGIN\
{
  fileA=$1
  fileB=$2
}\
NR==FNR\
{
  a[++i]=$0;next
}
{
  b[++j]=$0;
}
END\
{
  for(k=1;k<=j;k++)
    {
       print "\n======== " a[k] " ========"   
    }
}' $fileA $fileB

 
foreach first (`cat first.part`) 
  foreach second (`cat second.part`)
    toolcommand $first -toolcommand $second
  end
end