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sed Command on Multiple Files and retaining the same file name

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# 1  
Old 03-21-2016
sed Command on Multiple Files and retaining the same file name
Hi All

I am trying to run sed command to remove first 2 charcaters from a file on Multiple Files in my directory and what to retain the same file name .

I want to know how to retain the same file name but with changes .
Can some one please let me know how to proceed with this .

Below command just shows corrected output on command prompt , how to edit the file without changing the file name .

The below Script -

Code:
cd /home
ls * > test.txt
for i in `cat test.txt`;
  do
     sed '1s/..//' $i
   done

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Last edited by Don Cragun; 03-21-2016 at 05:38 AM.. Reason: Add CODE and ICODE tags.
# 2  
Old 03-21-2016
use sed -i

Code:
[user@host ~]$ cat file
hello
world
[user@host ~]$ sed '1s/..//' file
llo
world
[user@host ~]$ sed -i '1s/..//' file
[user@host ~]$ cat file
llo
world
[user@host ~]$

This User Gave Thanks to balajesuri For This Post:
honey26
# 3  
Old 03-21-2016
sed -i is not working on AIX -

Code:
sed: Not a recognized flag: i

Any other way to fix this .
Last edited by Don Cragun; 03-21-2016 at 05:42 AM.. Reason: Add CODE and ICODE tags again.
# 4  
Old 03-21-2016
sed -i basically uses a tmp file and then renames it to the original file. You could do the same. So, send the output to a new temp file. Rename the tmp file to original file.

Code:
sed '1s/^..//' file > tmp; mv tmp file

This User Gave Thanks to balajesuri For This Post:
honey26
# 5  
Old 03-21-2016
Thanks for your response -

It is not one file .
I am getting multiple files with date and time stamp

like abc.txt03212016124000, adc.txt03212016124001

How to fix this Scenario .
Last edited by Don Cragun; 03-21-2016 at 05:43 AM.. Reason: Add ICODE tags.
# 6  
Old 03-21-2016
You had it in your first post:
Code:
for i in *;
  do sed '1s/..//' $i > tmp && mv tmp $i
  done

# 7  
Old 03-21-2016
Untested, but should come close to what you want (although this seems extremely likely to destroy some data you might not want to destroy):
Code:
cd "$HOME"
for i in *
do	[ -f "$i" ] && sed '1s/..//' "$i" > "$i".mod && cp "$i".mod "$i" && rm -f "$i".mod
done

This is different from RudiC's suggestion and your original code as follows:
  1. the above assumes that you want to modify all of the regular files in your home directory,
  2. not all of the directories in the directory /home which seems to be what your script in post #1 in this thread would try to do, and
  3. not all files in the current directory as in RudiC's suggestion, AND,
  4. the combination of cp and rm commands (instead of just using an mv command) will preserve hard links on files (if there are any). Note, however, that if there are hard-linked files with more than one link in your home directory, two characters will be removed from the file for each link processed.
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