How to source ~/.profile through a script with effects lasting after the script has run? - Page 2 - maemo.org

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lidow	2011-09-02 , 06:36
Posts: 151 \| Thanked: 93 times \| Joined on Sep 2009 @ sofia, bulgaria	#11

You can also use this:

Code:

> echo $TRE

> ./tre.sh TRE=trep
> echo $TRE        
trep
>

file tre.sh

Code:

#!/usr/bin/env ksh

PID=$PPID
 
echo "Modifying $PID to set $1"
TMPFILE=/tmp/tre.tmp
cat<<EOF >$TMPFILE
attach $PID
call putenv ("$1")
detach
EOF
cat $TMPFILE
gdb -batch -x $TMPFILE > /dev/null
 
rm $TMPFILE

Although I prefer the exec solution more than this one. This requires gdb.

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白い熊	2011-09-02 , 19:28
Posts: 451 \| Thanked: 334 times \| Joined on Sep 2009	#12

Originally Posted by lidow

where in script.sh you source environment and then exec bash, will substitute your current shell with the one from the script. This will give you all environments you need, and will not open chain of subshells.

This does exactly what I have in mind...

However, there is the problem that you have to call the script via exec...

I need it to be callable just by a command. If I create a script with:

exec /path/to/script.sh

then when this script is run, it hatches another subinstance of bash in the current term window, instead of replacing it, which is what happens when called with exec directly.

Any way round it.

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lidow	2011-09-03 , 06:49
Posts: 151 \| Thanked: 93 times \| Joined on Sep 2009 @ sofia, bulgaria	#13

alias script="exec script"

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白い熊	2011-09-08 , 14:02
Posts: 451 \| Thanked: 334 times \| Joined on Sep 2009	#14

Works on the N900 as well through "exec sh" inside the script.

I want to build a universal script that will exec either bash or sh, depending on which environment it is run.

How do I determine programatically whether exec sh or bash inside a script? An equivalent of `echo $0` ran from within the terminal...