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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 OSF1
line
line(1) General Commands Manual line(1) NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)