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Shell Programming and Scripting
How to check for null value from makefile
Post 302297079 by jake_ryan on Thursday 12th of March 2009 12:44:55 PM
03-12-2009
How to check for null value from makefile
My makefile has some code as follows:
if [ `../${TOOLS_ROOT_PATH}/ext_tools.sh 1` ]; then \
echo copying tools; \
cp -f `../${TOOLS_ROOT_PATH}/ext_tools.sh 1` ${EXTERNAL_BIN_DIR} || exit $$?;\
fi; \
The ext_tools.sh is as follows:
cat ttx.conf | grep external | grep -v ^# | awk '{print $1}'
It can sometime result in nothing as existing tools in ttx.conf may not contain external tag to them. And sometimes, it might return a string of words separated by space.
With the above piece of code, if ext_tools.sh return string of words, /bin/sh is expecting argument -f or -z.
But if I put it there, when ext_tools.sh return nothing, /bin/sh is complaining again.
My question is how do I check its return value? More specifically, how do I check if it returned NULL? How do I separate words in the string?
I tried the following:
RESULT=`../${TOOLS_ROOT_PATH}/ext_tools.sh 1`; \
echo "$RESULT"; \
But echo prints ESULT.
When I do echo $(RESULT), echo doesnot print anything
When I do echo ${RESULT}, echo doesnot print anything.
I tried
set `../${TOOLS_ROOT_PATH}/ext_tools.sh 1`; \
echo $#; \
Again, echo doesnot print anything.
Please help.. I am out of ideas...
if [ `../${TOOLS_ROOT_PATH}/ext_tools.sh 1` ]; then \
echo copying tools; \
cp -f `../${TOOLS_ROOT_PATH}/ext_tools.sh 1` ${EXTERNAL_BIN_DIR} || exit $$?;\
fi; \
The ext_tools.sh is as follows:
cat ttx.conf | grep external | grep -v ^# | awk '{print $1}'
It can sometime result in nothing as existing tools in ttx.conf may not contain external tag to them. And sometimes, it might return a string of words separated by space.
With the above piece of code, if ext_tools.sh return string of words, /bin/sh is expecting argument -f or -z.
But if I put it there, when ext_tools.sh return nothing, /bin/sh is complaining again.
My question is how do I check its return value? More specifically, how do I check if it returned NULL? How do I separate words in the string?
I tried the following:
RESULT=`../${TOOLS_ROOT_PATH}/ext_tools.sh 1`; \
echo "$RESULT"; \
But echo prints ESULT.
When I do echo $(RESULT), echo doesnot print anything
When I do echo ${RESULT}, echo doesnot print anything.
I tried
set `../${TOOLS_ROOT_PATH}/ext_tools.sh 1`; \
echo $#; \
Again, echo doesnot print anything.
Please help.. I am out of ideas...
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LEARN ABOUT SUNOS
echo
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)