I have a bash script which calls another bash script, like so:
#!/bin/bash
echo "Hi"
./script-two.sh
echo "Hello!"
The problem that I have is that it never makes it to printing "Hello!"
I think this is because ./sc开发者_如何学Cript-two.sh (Which I did not write) is somehow exiting or changing the shell. I have included this script at the end of this post.
Is there a way I can gurentee that my execution will continue after script-two.sh executes?
I have looked into using the trap command, but I don't fully understand its use properly.
Thanks,
Casey
Here is the contents of what would be script-two.sh
#!/bin/sh
# This file is part of the DITA Open Toolkit project hosted on
# Sourceforge.net. See the accompanying license.txt file for
# applicable licenses.
# (c) Copyright IBM Corp. 2006 All Rights Reserved.
export DITA_HOME=cwd
if [ "${DITA_HOME:+1}" != "1" ]; then
echo "DITA_HOME environment variable is empty or not set";
exit 127;
fi
echo $DITA_HOME
cd "$DITA_HOME"
# Get the absolute path of DITAOT's home directory
DITA_DIR="`pwd`"
echo $DITA_DIR
if [ -f "$DITA_DIR"/tools/ant/bin/ant ] && [ ! -x "$DITA_DIR"/tools/ant/bin/ant ]; then
chmod +x "$DITA_DIR"/tools/ant/bin/ant
fi
export ANT_OPTS="-Xmx512m $ANT_OPTS"
export ANT_OPTS="$ANT_OPTS -Djavax.xml.transform.TransformerFactory=net.sf.saxon.TransformerFactoryImpl"
export ANT_HOME="$DITA_DIR"/tools/ant
export PATH="$DITA_DIR"/tools/ant/bin:"$PATH"
NEW_CLASSPATH="$DITA_DIR/lib:$DITA_DIR/lib/dost.jar:$DITA_DIR/lib/commons-codec-1.4.jar:$DITA_DIR/lib/resolver.jar:$DITA_DIR/lib/icu4j.jar"
NEW_CLASSPATH="$DITA_DIR/lib/saxon/saxon9.jar:$DITA_DIR/lib/saxon/saxon9-dom.jar:$NEW_CLASSPATH"
NEW_CLASSPATH="$DITA_DIR/lib/saxon/saxon9-dom4j.jar:$DITA_DIR/lib/saxon/saxon9-jdom.jar:$NEW_CLASSPATH"
NEW_CLASSPATH="$DITA_DIR/lib/saxon/saxon9-s9api.jar:$DITA_DIR/lib/saxon/saxon9-sql.jar:$NEW_CLASSPATH"
NEW_CLASSPATH="$DITA_DIR/lib/saxon/saxon9-xom.jar:$DITA_DIR/lib/saxon/saxon9-xpath.jar:$DITA_DIR/lib/saxon/saxon9-xqj.jar:$NEW_CLASSPATH"
if test -n "$CLASSPATH"
then
export CLASSPATH="$NEW_CLASSPATH":"$CLASSPATH"
else
export CLASSPATH="$NEW_CLASSPATH"
fi
"$SHELL"
It looks like script-two.sh
is setting up an ant build environment.
I think the author intended that it sets up the build environment, then you type your build commands in manually, then type exit
to leave the build environment.
I say this because the bottom line of script-two.sh
is:
"$SHELL"
which starts a new shell.
Try running your script, then type exit
. I think you will see it print Hello!
after you type exit
.
I'm guessing you're trying to do something like:
#!/bin/bash
echo "Hi"
./script-two.sh
ant <some args>
To do that, what you really want to do is source it, by changing:
./script-two.sh
to
. script-two.sh
e.g.
#!/bin/bash
echo "Hi"
. script-two.sh
ant <some args>
But, you will need to edit script-two.sh
and change:
"$SHELL"
to:
case $0 in *script-two.sh)
# executed, start a new shell with the new environment
"$SHELL"
;;
*)
# sourced, don't start a new shell
;;
esac
so that it only starts a shell if the script is being run like ./script-two.sh
, but not if it is being sourced like . script-two.sh
.
Or if you absolutely can't change script-two.sh
, then you could do:
#!/bin/bash
echo "Hi"
. script-two.sh </dev/null
ant <some args>
which will trick "$SHELL"
into exiting because it has no input.
Also
export DITA_HOME=cwd
doesn't seem right to me.
It should probably be
export DITA_HOME=$(pwd)
or
export DITA_HOME=`pwd`
(both are equivalent)
I had a similar problem today, up on digging I finally found the answer.
The script I was calling (from within my script) actually had an exit 0 in the end. Removing that fixed my issues.
Just leaving this here as someone may find it useful.
Well for starters, you can execute your bash script with the -x switch to see where it is failing:
bash -x script-one.sh
Secondly, if you call the second script like this:
#!/bin/bash
echo "Hi"
var=$(bash script-two.sh)
echo "Hello!"
It will continue, as long as script-two.sh exits cleanly. Again, you can run the -x script against that script find any problems.
And as Mikel mentioned, always make sure to have exit
at the bottom of your scripts.
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