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Shell Programming and Scripting

editing files

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# 15  
Old 07-22-2009
Quote:
Originally Posted by vgersh99
sorry:
Code:
#!/bin/sh

for i in *.txt 
do
  echo $i
  printf '1,$s/see/saw/g\nwq!\n' | ex -s "${i}" 
done

Thank you so much.. This is working fine.

One more request please could you explain the command line
printf '1,$s/see/saw/g\nwq!\n' | ex -s "${i}" as i am not much familiar with this. Is it possible to execute this line at the command prompt as i am getting an error like "bash: ./r1.txt: Permission denied"

Thanks a lot
# 16  
Old 07-22-2009
Quote:
Originally Posted by cobroraj
Thank you so much.. This is working fine.

One more request please could you explain the command line
printf '1,$s/see/saw/g\nwq!\n' | ex -s "${i}" as i am not much familiar with this. Is it possible to execute this line at the command prompt as i am getting an error like "bash: ./r1.txt: Permission denied"

Thanks a lot
Most likely you don't have 'write' access write for ./r1.txt file - check its permissions.
'ex' is very similar to 'sed' in terms of the command options.
If I do:
Code:
printf '1,$s/see/saw/g\nwq!\n'

I get:
Code:
1,$s/see/saw/g
wq!

The first line looks familiar, doesn't it? Very similar to sed's.
The second line simply instructs 'ex' to write (w) the file and quit (q) 'ex'.
The loop takes care of iterating through the files.
'man ex' for more details.
# 17  
Old 07-22-2009
Quote:
Originally Posted by vgersh99
Most likely you don't have 'write' access write for ./r1.txt file - check its permissions.
'ex' is very similar to 'sed' in terms of the command options.
If I do:
Code:
printf '1,$s/see/saw/g\nwq!\n'

I get:
Code:
1,$s/see/saw/g
wq!

The first line looks familiar, doesn't it? Very similar to sed's.
The second line simply instructs 'ex' to write (w) the file and quit (q) 'ex'.
The loop takes care of iterating through the files.
'man ex' for more details.
Got most of it. Thanks a lot. Only one which i did not get is the meaning of 1,$ after the printf. s/see/saw/g is same as we use for stream ed.

Thanks and regards
# 18  
Old 07-23-2009
Quote:
Originally Posted by cobroraj
whats wrong with this code..please

Code:
#!/bin/sh
allone=`ls *.txt`
echo $allone
for i in ${allone}
do
echo $i
sed -s /${i} <<EOF
g/see/s/see/saw/g
w
q
EOF
done

i have two text files in which i have 'see' and i want to make it 'saw'

the scripts executes fine but i dont see any replacement done.

Thanks
What I see is that you're using 'sed' instead of 'ed'. I haven't tested your specific code, but otherwise is looks ok.

Also, the 1,$ question. This just means perform the search/replace from the beginning (1) to the end ($) in terms of line numbers. Actually, though functionally I'm sure this definition is probably accurate enough, but I've been wrong plenty of times and it may not tell the whole story.

What I really like about this thread is that it demonstrates so well that the question is not whether I can do something via command line/script, but more of which solution do I want to use.
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