Prev: Old version of linux?
Next: Bootable USB for bootable ISO image?
From: undisclosed on 10 Sep 2009 08:12

Hi ,

you can continue to work in Bash script by adding the following
changes in passwd file present at the path cd /etc/

in passwd file under root change the
root:x:0:0:Super-User:/root:/bin/ksh

to root:x:0:0:Super-User:/root:/bin/bash

rupert;1253510 Wrote:
> I've been going through a very good bash scripting tutorial here:
> 'Parameter Substitution'
> (http://tldp.org/LDP/abs/html/parameter-substitution.html#PSUB2)
>
> It is based on the Korne-shell (so naturally the she-bang is: #!/bin/
> ksh)
> but I want to continue to program in my Borne-again-shell with #!/bin/
> bash
> (or #!/bin/sh as I gather ubuntu 8.10 is bash by default).
>
> #!/bin/bash
> #this causes a Bad substitution error...
> path_name=/home/bozo/ideas/somestuff
> t=${path_name/bozo/clown} #this will fail here...
> echo $t
> exit 0
>
> what is the Bash alternative to do a substitution like this?


--
venkatareddy
From: Eric on 10 Sep 2009 21:45
undisclosed wrote:
> Hi ,
>
> you can continue to work in Bash script by adding the following
> changes in passwd file present at the path cd /etc/
>
> in passwd file under root change the
> root:x:0:0:Super-User:/root:/bin/ksh
>
> to root:x:0:0:Super-User:/root:/bin/bash
>
> rupert;1253510 Wrote:
>> I've been going through a very good bash scripting tutorial here:
>> 'Parameter Substitution'
>> (http://tldp.org/LDP/abs/html/parameter-substitution.html#PSUB2)
>>
>> It is based on the Korne-shell (so naturally the she-bang is: #!/bin/
>> ksh)
>> but I want to continue to program in my Borne-again-shell with #!/bin/
>> bash
>> (or #!/bin/sh as I gather ubuntu 8.10 is bash by default).
>>
>> #!/bin/bash
>> #this causes a Bad substitution error...
>> path_name=/home/bozo/ideas/somestuff
>> t=${path_name/bozo/clown} #this will fail here...
>> echo $t
>> exit 0
>>
>> what is the Bash alternative to do a substitution like this?
>
>
from the Advanced Bash Scripting pdf:
Substring Replacement
${string/substring/replacement}
Replace first match of $substring with $replacement.
${string//substring/replacement}
Replace all matches of $substring with $replacement.
stringZ=abcABC123ABCabc
echo ${stringZ/abc/xyz} # xyzABC123ABCabc
# Replaces first match of 'abc' with 'xyz'.
echo ${stringZ//abc/xyz} # xyzABC123ABCxyz
# Replaces all matches of 'abc' with # 'xyz'.

Your script should work.
Eric
 | 
Pages: 1
Prev: Old version of linux?
Next: Bootable USB for bootable ISO image?