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Shell Programming and Scripting
Nested while read line loop
Post 75853 by Rakker on Wednesday 22nd of June 2005 12:25:14 PM
06-22-2005
Nested while read line loop
Hi,
Can anyone please help me: i'm trying to read a file with directory-names , then go to that directory and read another (output) file to perform some tasks per line (second read line in the part of script below).
The problem is that after the nested while loop has finished, the first while finsihes too. So the first while loop only executes once
. I'm guessing that I'm using read line the totally wrong way, but my knowledge of unix
is unfortunately not so good
(just started scripting).
(part of script: I left out some irrelevant peaces to make it easier to read)
exec 0< dir_list_file.txt
while read line
do
cat input_file.txt | grep "^>>" | cut -c 4- > output_file.txt
exec 0< output_file.txt
while read line
do
empl_id=`echo $line | awk ' { print $1; } '`
empl_dir=`echo $line | awk ' { print $2; } '`
<... etc..>
done
done
Thanx in advance
Can anyone please help me: i'm trying to read a file with directory-names , then go to that directory and read another (output) file to perform some tasks per line (second read line in the part of script below).
The problem is that after the nested while loop has finished, the first while finsihes too. So the first while loop only executes once
. I'm guessing that I'm using read line the totally wrong way, but my knowledge of unix is unfortunately not so good
(just started scripting).(part of script: I left out some irrelevant peaces to make it easier to read)
exec 0< dir_list_file.txt
while read line
do
cat input_file.txt | grep "^>>" | cut -c 4- > output_file.txt
exec 0< output_file.txt
while read line
do
empl_id=`echo $line | awk ' { print $1; } '`
empl_dir=`echo $line | awk ' { print $2; } '`
<... etc..>
done
done
Thanx in advance
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LEARN ABOUT CENTOS
line
line(1) User Commands line(1) NAME
line - read one line SYNOPSIS
line DESCRIPTION
The line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal. EXIT STATUS
Exit status is: 0 Successful completion >0 End-of-file on input. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), read(2), attributes(5) SunOS 5.10 1 Feb 1995 line(1)