Script to change first line of files in directory Post: 302653603

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Top Forums Shell Programming and Scripting Script to change first line of files in directory Post 302653603 by LMHmedchem on Saturday 9th of June 2012 03:01:41 PM

06-09-2012

Registered User

Sorry, I didn't see these last two posts, I will give the code a try.

LMHmedchem

---------- Post updated at 03:01 PM ---------- Previous update was at 02:42 PM ----------

Well using the script posted by alister, I get the following error,

line 14: ed: command not found

line 14 is,

printf %s\\n 1c "$f" . w q | ed -s "$f"

If I add the code from agama, I get the following error,

line 5: cd: ./test_script/: No such file or directory
abort: could not switch to './test_script/' or parameter was missing

This is the code I am using,

Code:

#!/usr/bin/bash

# mol_filename2firstline_2.sh 

cd "$1"

if ! cd "${1:-no-such-directory}"     # also quote on the off chance that something in the path has spaces
then
   echo "abort: could not switch to '$1' or parameter was missing"
   exit 1
fi

for f in *; do
    [ ! -f "$f" ] && continue
    if [ -s "$f" ]; then
        printf %s\\n 1c "$f" . w q | ed -s "$f"
    else
        printf %s\\n "$f" > "$f"
    fi
done

run as,

./mol_filename2firstline_2.sh test_script/

I did stick my code into the loop to see what would happen, and it does work.

Code:

#!/usr/bin/bash
# mol_filename2firstline_3.sh 
# accepts a directly name dir/ and add replaces the first line of all .mol files
# with the filename

cd "$1"

for f in *.mol; do
   sed "1 c\\$f" $f > TEMP
   cp -f TEMP $f
   rm -f TEMP
done

It is rather slow at 1.4s for 20 files.

LMHmedchem

LMHmedchem

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LEARN ABOUT SUSE

command-not-found

COMMAND-NOT-FOUND(1)					    http://en.opensuse.org/Sco					      COMMAND-NOT-FOUND(1)

NAME

       command-not-found - A command-not-found handler

SYNOPSIS

       command-not-found {binary_name} {repository}

ARGUMENTS

       The following arguments are required:

       binary_name
	   The name of binary you are looking for.

       repository
	   The name of repository for search. For most cases, use zypp

DESCRIPTION

       command-not-found handler is designed to tell users which package contains a missing command.

       The handler is integrated to bash(1) and zsh(1) shells and is not necessary to call it directly. Just type a name of the command in your
       favourite shell and you'll get a result.

       If you consider c-n-f handler useless, just add unset command_not_found_handle to your profile or remove the command-not-found package.

       Handler doesn't call the command-not-found binary directly, it only prints info about it. If you want to invoke it automatically, just add
       export COMMAND_NOT_FOUND_AUTO=1 to your bash profile.

EXAMPLE
: NORMAL USAGE
       For example you want to try blender, because you have heard that is an amazing program. So just type blender in shell:

	   $ blender

       You get the following output:

	   The program 'blender' can be found in the following package:
	     * blender [ path: /usr/bin/blender, repository: zypp (openSUSE 11.1-0) ]

	   Try installing with:
	       sudo zypper install blender

	   bash: blender: command not found

SEE ALSO

       scout(1)

AUTHOR

       Pavol Rusnak <stick@gk2.sk>
	   Developer

http://gitorious.org/opensus					    08/07/2009						      COMMAND-NOT-FOUND(1)