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Top Forums Shell Programming and Scripting Issue in using read keyword twice Post 302929438 by derekludwig on Sunday 21st of December 2014 12:54:39 PM
Old 12-21-2014
Ravindra,

Your script:
Quote:
Originally Posted by Ravindra Swan
Code:
while read line
do
echo "press oprion"
read kind
echo "kind=$kind"
echo "line=$line"
done<t.txt

is working as written, once the missing quotes were added:
Code:
$ ksh -x t.ksh 
+ 0< t.txt
+ read line
+ echo 'press oprion'
press oprion
+ read kind
+ echo kind=d
kind=d
+ echo line=a
line=a
+ read line
+ echo 'press oprion'
press oprion
+ read kind
+ echo kind=
kind=
+ echo line=c
line=c
+ read line

The first read assigned "a" to line, the second read assigned "d" to kind. The loops repeats and assigned "c" to line and "" to kind. Maybe this would make more sense if the input file contained:
Code:
Line 1  a
Line 2  d
Line 3  c
Line 4

And the resulting output would be:
Code:
press oprion
kind=Line 2  d
line=Line 1  a
press oprion
kind=Line 4
line=Line 3  c

Is this the desired behavior?
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - read one line from user input SYNOPSIS
timeout] DESCRIPTION
copies one line (up to a new-line) from the standard input and writes it on the standard output. It returns an exit code 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. Options recognizes the following command-line option: Timeout after timeout seconds where timeout is an integer value (if a non-integer value is specified, it is converted to an integer; i.e., rounded down). A blank is required between and the timeout argument. This option is not documented in POSIX and other industry standards, and should not be used in portable applications. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. EXAMPLES
The following lines in a shell script prompt for a file name and display information about the file: To limit the response time to 10 seconds, use the form: then test for no response. If no response occurs before timeout expires, a default behavior should be provided. WARNINGS
This command is likely to be withdrawn from X/Open standards. Applications using this command might not be portable to other vendors' sys- tems. As an alternative is recommended. SEE ALSO
sh(1), read(2). STANDARDS CONFORMANCE
line(1)
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