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Top Forums Shell Programming and Scripting Bash conditional | getting logic wrong? Post 302780129 by the_gripmaster on Thursday 14th of March 2013 01:21:18 AM
Old 03-14-2013
Question Bash conditional | getting logic wrong?

I have a file

Code:
cat <<EOF > /tmp/test
Line one
Line two 
Line three
EOF

Now I am trying to get the exit stat ($?) of 1 if any text is found and 0 if any text is not found using grep, i.e. just reversing the exit status of grep

Code:
# (snippet 1) this one is not working!!! retval $? should be 1
grep -q 'one' /tmp/test && false || true
echo $?


# (snippet 2) but this one is working - retval is 1
grep -q 'one' /tmp/test
if [ $? -eq 0 ]; then 
    false
else 
    true
fi
echo $?

What am I missing in snippet 1?
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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