12-16-2008
Dear jimbalaya, I just added "echo $$" to see which shell I am in, it turned out that I am in the same shell all the time. however the value of $TO is not updated inside the while loop!
---------------------
#!/bin/bash
TO=1
for i in key1 key2;do
TO=0
grep $i ./filelist |\
while read FILE;do
let TO=$((${TO}+`cat $FILE|wc -l`))
echo "To value increased to ${TO}"
echo "we are in the shell $$"
done
echo "we are in the shell $$"
echo "TO value is ${TO}"
done
--------------------------------
output
-------------------------------
To value increased to 3
we are in the shell 12851
To value increased to 8
we are in the shell 12851
we are in the shell 12851
TO value is 0
To value increased to 2
we are in the shell 12851
To value increased to 11
we are in the shell 12851
we are in the shell 12851
TO value is 0
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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)