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use vimdiff inside while read

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# 1  
Old 09-22-2011
use vimdiff inside while read
Hi,

I need to read a file name from a txt file, found the difference in two folders, then modify the file using vimdiff,

Code:
while read file
do
 diff src/$file dest/$file > /dev/null 2>&1
 if [ $? -eq 0]; then
    vimdiff src/$file dest/$file 
fi
done < ./my_text_file

since the stdin has been redirect to file my_text_file, vimdiff can't work properly.

anyone can help me to fix it?

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.


thanks.

peter
# 2  
Old 09-22-2011
Try this:

Code:
while IFS= read -r; do
  diff src/"$REPLY" dest/"$REPLY" || ( 
    exec 0< /dev/tty
    vimdiff src/"$REPLY" dest/"$REPLY" 
    )
done < infile

These 2 Users Gave Thanks to radoulov For This Post:
laopi vgersh99
# 3  
Old 09-22-2011
Quote:
Originally Posted by radoulov
Try this:

Code:
while IFS= read -r; do
  diff src/"$REPLY" dest/"$REPLY" || ( 
    exec 0< /dev/tty
    vimdiff src/"$REPLY" dest/"$REPLY" 
    )
done < infile

works like a charm
# 4  
Old 12-30-2011
Quote:
Originally Posted by radoulov
Try this:

Code:
while IFS= read -r; do
  diff src/"$REPLY" dest/"$REPLY" || ( 
    exec 0< /dev/tty
    vimdiff src/"$REPLY" dest/"$REPLY" 
    )
done < infile

------------------------------------

could anyone please explain how this script work ?
# 5  
Old 12-30-2011
It redirects the standard input to the controlling terminal inside the loop:

Code:
exec 0< /dev/tty

In this way the program vimdiff reads the user input instead of the stream coming from the pipe.
# 6  
Old 01-02-2012
Thanks,

Could you please explain the significance of the diff command as well

Code:
diff src/"$REPLY" dest/"$REPLY" ||
 ...

Last edited by radoulov; 01-02-2012 at 10:23 AM.. Reason: Code tags!
# 7  
Old 01-02-2012
This is a logical OR:

Code:
command1 || command2

In this case command2 will be executed only if command1 returns status different than 0 (i.e. if the files to be compared are different).
This User Gave Thanks to radoulov For This Post:
tinivt
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