running script bash to fill my files

[alejandroye]

Hi guys

I have around 600 empty text files that I need to add the name of this file as part of the data, I mean

files from "file1.txt to "file599.txt, all of them empty, and I need to get the name inside the file, so, when I open the file show the name as part of the data "file1".

these files were created on my web site, I am thinking in a small script in bash

Can somebody can help me with this?


Thanks

[ultimatelinux]

first type
function rename()
{
i=0;
for j in $*
do
mv $j file$i.txt
i=`expr $i + 1`
done
}
in the terminal

or copy this code.
then go to the directory where all the 600 files are located(if they are not in a directory move all of them to one directory).
then type
rename `ls`
thats all,your work is done.
it worked,i checked it.
copy the code i typed.

[drl]

Hi.

My understanding of your problem is that for files like the name:

file42.txt

you want the content of the file to be the name of the file, like:

file42.txt

Assuming this is correct, then consider this script:

#!/usr/bin/env bash

# @(#) s1	Demonstrate make name of file be written *to* the file.

# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p
set -o nounset
echo

# Remove old stuff, set up for test.

echo " Initial conditions:"
rm -f file*.txt
touch file{1..3}.txt
ls -lgG file*.txt

echo
echo " Results:"
for f in file*txt
do
  echo $f > $f
done

ls -lgG file*txt

echo
echo " Sample contents: file2.txt:"
cat file2.txt

exit 0

which prodcues:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39

 Initial conditions:
-rw-r--r-- 1 0 Mar 21 06:10 file1.txt
-rw-r--r-- 1 0 Mar 21 06:10 file2.txt
-rw-r--r-- 1 0 Mar 21 06:10 file3.txt

 Results:
-rw-r--r-- 1 10 Mar 21 06:10 file1.txt
-rw-r--r-- 1 10 Mar 21 06:10 file2.txt
-rw-r--r-- 1 10 Mar 21 06:10 file3.txt

 Sample contents: file2.txt:
file2.txt

The inner for loop is the code that does the job, the rest is for setup, display, etc. You said that the files were empty, so this code does not try to save anything in the file; if there is any content in the files, it will be over-written.

I suggest that you first try this in a test directory, then you modify as necessary, keeping at least that for loop, and try it again. If it works, then run it for real in the directory of interest.

Best wishes ... cheers, drl

[alejandroye]

Hi.

My understanding of your problem is that for files like the name:

file42.txt

you want the content of the file to be the name of the file, like:

file42.txt

Assuming this is correct, then consider this script:
[CODE]#!/usr/bin/env bash

thanks guys.

I think the loop has to be change because I need the content without the extension, so it will be >> ... right?

thanks again?

[drl]

Hi.

If you change the echo inside the loop to:

echo ${f%%.txt} > $f

then it will produce (excerpt):

 Results:
-rw-r--r-- 1 6 Mar 21 08:40 file1.txt
-rw-r--r-- 1 6 Mar 21 08:40 file2.txt
-rw-r--r-- 1 6 Mar 21 08:40 file3.txt

 Sample contents: file2.txt:
file2

cheers, drl

( Edit 1: fix typo in description ]

[sixdrift]

Ok, I read your original post to mean "write the filename into the file, destroying any contents". Meaning, don't keep the data in the file as is, just load it with the filename.

Given that premise, here is my solution to your problem:

#!/bin/bash

for datfile in *.txt
do
    bname=$(basename $datfile .txt)
    echo "$bname" > $datfile
done

Now if you wanted to prefix the name onto existing data, its only a slight modification to preserve the file contents with a temp file.

#!/bin/bash

tmpfile=$(mktemp  /tmp/fixemXXXXXXXX)
for datfile in *.txt
do
    bname=$(basename $datfile .txt)
    echo "$bname" > $tmpfile
    cat $datfile >> $tmpfile
    rm $datfile
    mv $tmpfile $datfile
done