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TonyLB
LXF regular
Joined: Tue Apr 12, 2005 8:08 pm
Posts: 111
Location: Wirral, UK
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 Posted: Tue Jan 10, 2006 2:45 pm Post subject: hard coding keyboard input in a Bash script |
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I'm trying to write a couple of Bash scripts which use utility programs that take keyboard input (eg update-alternatives --config xxx needs a choice from the keyboard.
I want to automate it from a parameter passed when the script is used. At the moment my best effort writes a file using the input parameter, runs update-alternatives redirecting input from the newly created file, then deletes the file.
There must be a better way I'm sure. How can you pass a parameter rather than use keyboard input without writing it to a file first?
Tony |
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nelz
Moderator
Joined: Mon Apr 04, 2005 12:52 pm
Posts: 7999
Location: Warrington, UK
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| Posted: Tue Jan 10, 2006 2:58 pm Post subject: RE: hard coding keyboard input in a Bash script |
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| Code: | | echo "xxx" | update-alternatives --config <&0 |
echo sends the command to stdout
the pipe sends the stdout to stdin for the next command
&0 is the file handle for stdin, so <&0 redirects it to the command.
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Unix is user-friendly. It's just very selective about who it's friends are. |
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CJLL
LXF regular
Joined: Sat Jul 09, 2005 10:22 pm
Posts: 193
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| Posted: Tue Jan 10, 2006 11:03 pm Post subject: RE: hard coding keyboard input in a Bash script |
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Bash scripts accept upto 9 parameters on the command line, they are named $1 to $9
| Code: |
#!/bin/sh
echo "Param 1: $1"
update-alternatives --config $1
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Alternatively if you want your script to get interactive
| Code: |
!/bin/sh
echo -n "Enter your name: "
read -e NAME
echo "Hello $NAME"
update-alternatives --config $NAME
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TonyLB
LXF regular
Joined: Tue Apr 12, 2005 8:08 pm
Posts: 111
Location: Wirral, UK
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| Posted: Wed Jan 11, 2006 3:40 pm Post subject: RE: hard coding keyboard input in a Bash script |
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Thanks folks - I should have thought of echo!
Neltz's one does just what I needed.
Tony |
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drws
LXF regular
Joined: Sat Aug 06, 2005 11:39 am
Posts: 125
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| Posted: Wed Jan 11, 2006 6:22 pm Post subject: Re: RE: hard coding keyboard input in a Bash script |
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| CJLL wrote: | | Bash scripts accept upto 9 parameters on the command line, they are named $1 to $9 |
Don't forget ${10} ${11} ${12} etc. if you need more than 9 parameters |
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