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Shell Programming and Scripting

echo doesn't work right

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# 15  
Old 03-03-2011
Thats a shame I could duplicate your issue by setting posix mode and xpg_echo:

Code:
$ set -o posix
$ shopt -s xpg_echo
$ echo -e testing
-e testing

Or
Code:
$ bash --posix -O xpg_echo
$ echo -e testing
-e testing

Perhaps your shell was compiled with --enable-strict-posix-default
Last edited by Chubler_XL; 03-03-2011 at 09:44 PM..
# 16  
Old 03-03-2011
Quote:
Originally Posted by Chubler_XL
Thats a shame I could duplicate your issue by setting posix mode and xpg_echo:

Code:
$ set -o posix
$ shopt -s xpg_echo
$ echo -e testing
-e testing

Or
Code:
$ bash --posix -O xpg_echo
$ echo -e testing
-e testing

Perhaps your shell was compiled with --enable-strict-posix-default
I got the same output when I type the code above.
-e testing

And if my shell is using posix by default,when I type
Code:
echo -e

it should print -e ,right?
But it just print a blank line.

By the way,when I want to turn off the posix using set command,what should I type?
# 17  
Old 03-03-2011
Code:
set +0 posix

to turn off

So is it correct that echo -e gives a blank line; but echo -e "Hello,World\a\n" gives:
-e Hello,World
# 18  
Old 03-03-2011
Quote:
Originally Posted by Chubler_XL
Code:
set +0 posix

to turn off

So is it correct that echo -e gives a blank line; but echo -e "Hello,World\a\n" gives:
-e Hello,World
echo -e "Hello,World\a\n" goes right when I type it in my bash,but goes wrong when I add it in my shell script.
# 19  
Old 03-03-2011
Ah does the script have "#!/bin/sh" at the top, cause bash will go into posix mode if it's called with the name sh
# 20  
Old 03-03-2011
Quote:
Originally Posted by Chubler_XL
Ah does the script have "#!/bin/sh" at the top, cause bash will go into posix mode if it's called with the name sh
I use #!/bin/bash in my script.

Plus,
Code:
bash firstscript.sh

output
Hello,World
Code:
sh firstscript.sh

output
-e Hello,World
Last edited by Demon; 03-03-2011 at 11:16 PM..
# 21  
Old 03-04-2011
Quote:
Originally Posted by Demon
I use #!/bin/bash in my script.

Plus,
Code:
bash firstscript.sh

output
Hello,World
Code:
sh firstscript.sh

output
-e Hello,World

When you execute the script with shell command mode ( provide shell name), the shebang is ignored.


sh firstscript.sh, bash firstscript.sh, ksh firstscript.sh will execute the script in Bourne, Bash and Korn shell respectively. No matter what the shebang is.
This User Gave Thanks to clx For This Post:
Demon
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