CODEWITHSUNDEEP
bashcsh
estani
estani

Reputation: 26467

from csh to bash and re-source the same file

I have a bash file that needs to get sourced. Users might have a csh without knowing (default configuration) so I wanted to change the shell to bash but sourced the file as that was the user's intention.

There are a lot of help around this and the resulting code would be:

#!/bin/csh (AND bash!)
[ "$?shell" = "1" ] && bash --login -c 'source this_file; bash' && exit
...

Everything works as expected besides the fact that the sourced file this_file must be hard-coded. In csh $_ would contain source this_file as that was the command that started sourcing the script, but there is no way I can pass it to the bash command.

This means:

  1. If I use:

    ... && set this_file=($_) && bash -c "$this_file; bash" && ...

    bash will complain that the parenthesis are wrong (this happens the second time as bash is started and tries to source this_file

  2. If I use:

    ... && bash -c ""$_"; bash" && ...

    bash gets a broken command that doesn't work either: bash -c "source" "this_file" "; bash"

  3. If I use:

    ... && bash --login -c "$_; bash" && ...

    csh gets a broken command: `Unmatched ".

I can't find out how to use $_ with an accepted bash syntax that passes the value as a single command (i.e. bash -c "source this_file; bash")

This is the test:

cat >a.sh<<'EOF'
[ "$?shell" = "1" ] && bash --login -c 'source a.sh; bash' && exit
a=1
EOF

And then I expect this to work:

$ csh -c 'source a.csh'
$ echo $a
1

I'm pretty sure it used to work... I'm trying to find out why it doesn't now. (I solved this problem using the tcl modules package, but I'll give this a try)

Upvotes: 1

Views: 701

Answers (1)

vron11
vron11

Reputation: 11

It is possible to pass arguments to a bash -c 'cmd' construct, i. e. bash -c 'echo $@' arg0 1 2 3 4 5!

#!/bin/csh (AND bash!)
#[ "$?shell" = "1" ] && bash --login -c 'source this_file; bash' && exit
[ "$?shell" = "1" ] && bash --login -c '${@}; bash' arg0 $_ && exit

Upvotes: 1

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