Shell Programming and Scripting

frnds,

I have lots of files .. the contents of these files are semicolon delimited.
like

Cmpabc;20080215;20080215082141;20080215082812;199483;43188746

i want to insert 1 more value in the beginning... ( there are 2 options for this value depends on the file name...)

I 'll handle that with if.. ( m i right ??? )

so , like after the operation ..the content sud be

X;Cmpabc;20080215;20080215082141;20080215082812;199483;43188746


more details lets i have 2 files X_ABC.dat and Y_ABC.dat
so i want to insert X for the first file n Y for the second ....

pl help...
-anchal.

Code:

word=whatever
{
  IFS= read -r line
  printf "%s %s\n" "$word" "$line" 
  cat
} < FILENAME > NEWFILE

This problem looks awful, but is quite simple once you know that you can address the whole matched expression by a "variable": "&". Here is an example:

Code:

print "hello world" | sed 's/^.*$/=&=/'

When you try that you will see that "hello world" is now surrounded by equal signs. The expression "^.*$" matches whole lines regardless of their content.

Hence, if you want to insert "X;" at the beginning of the line:

Code:

sed 's/^.*$/X;&/' /your/file

If you do that inside a script you might hold the text you want to insert in some shell variable. Then you will have to expand the variable inside the script:

Code:

sed 's/^.*$/'"$var"';&/' /your/file

Fill the variable $var with whatever you want to add at the beginning of the lines.

I hope this helps.

bakunin

hey bakunin...

I have roughly tried these commands ... these are working well...
'll try to implement in my script. [ hope I'd solve the other probs,,, :-) ]

thanks for the help..

thanks 2 all..

How abt this:

echo "hello world" | awk '{ print "X;"$0}'
X;hello world

One more using remembering patterns

echo "hello world" | sed 's/\(.*\)/X;\1/'
X;hello world

frnds..,
I m lltle messed up while implementing this logic.... :-(

actually... as i already wrote here that I want to prepend "X;" only if filenames contains
X. and "Y;" if filenames contains Y.

this is what i did.. ( code shown for this part only.. )


for FILENAME in `ls -1 $FileDir/ABC_?_123.tmp`
do
FOUND=`ls -1 $FileDir/ABC_?_123.tmp | grep X`
if [ "$FOUND" ]
then
TMP=tmpfile_$$
sed -e 's/^.*$/X;&/' < $FILENAME > $TMP
mv $TMP $FILENAME
else
echo "The file $FILENAME does not include the word X"
fi
done



now what happenps is.. I got all my files with "X;" prepended to them.., which comes under the for loop condition...


what cud be the prob?
or can any1 suggest any other logic??

thanks..