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Top Forums Shell Programming and Scripting ksh vs perl strange interaction. Post 302486637 by jlovi on Sunday 9th of January 2011 09:10:53 PM
Old 01-09-2011
ksh vs perl strange interaction.

Hello everybody,

I isolated an issue: please try the following script (under AIX)

Code:
#!/usr/bin/ksh93


echo "Before Perl: \c"
read line
echo "|$line|"

perl -e 'print "Perl invocation";'
echo

echo "After Perl: \c"
read line
echo "|$line|"

On the first input, type Ctrl-D. It works
On the second input, type Ctrl-D. You'll need to type it twice.

Now, change the script to use ksh instead of ksh93. It works fine.

Smilie

What's wrong? Any workaround?

Jacques.

Last edited by jlovi; 01-09-2011 at 10:58 PM..
 

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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)
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