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Top Forums Shell Programming and Scripting pass a variable to sed p in a loop? Post 302154926 by drl on Wednesday 2nd of January 2008 01:33:14 PM
Old 01-02-2008
Hi.

The {} are usually used:
Code:
#!/bin/sh -

# @(#) s1       Demonstrate disambiguation.

j=245

echo $j #works fine
echo $filename #works fine
echo "'$jp'" "$filename" #NO GOOD
echo '"$jp"' $filename #NO GOOD
echo -n 20p $filename #works fine


echo
echo
echo " Best practice:"
echo sed -n "${j}p"

exit 0

producing:
Code:
% ./s1
245

''
"$jp"
20p

 Best practice:
sed -n 245p

Best wishes ... cheers, drl
 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.10 5 Jun 2002 echo(3XCURSES)
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