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What's the difference between !/bin/sh and !/bin/bash?
Posted: Tue 23 May 2006, 16:29
by NickBiker
Hi!
Just wondered if anyone could help with this slightly odd problem!
In the Puppy console I can type:
Code: Select all
#alpha="abcdef"
#echo ${alpha/abc/xyz}
#xyzdef
Which is how it should be using the substition {a/b/n}
BUT if I do the same thing in a standard script I get an error:
Code: Select all
#!/bin/sh
alpha="abcdef"
echo ${alpha/abc/xyz}
I get: ...4: Syntax error: Bad Substitution
Am I going mad!
Posted: Tue 23 May 2006, 16:48
by MU
#!/bin/bash
not
#!/bin/sh
Mark
Posted: Tue 23 May 2006, 18:32
by NickBiker
MU wrote:#!/bin/bash
not
#!/bin/sh
Mark
Hi!
Oh! I thought /bin/sh would be a symbolic link to bash? What is it then?!
Thanks for help
Posted: Tue 23 May 2006, 18:47
by MU
no, sh is a symbolic link to busybox.
Busybox has the more limited ash -shell, that is used in image.gz when Puppy boots.
ash has less possibilities than bash, but allows to keep image.gz small.
Mark
Posted: Wed 24 May 2006, 10:30
by NickBiker
MU wrote:no, sh is a symbolic link to busybox.
Busybox has the more limited ash -shell, that is used in image.gz when Puppy boots.
ash has less possibilities than bash, but allows to keep image.gz small.
Mark
Hi Mark
Thanks for help! I was wondered if I was going mad a could not get for loops to work either! Still it is good practice to work out ways to do things using a limited command set!!