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Old 03-05-2010, 08:56 AM   #1
m4rtin
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Registered: Sep 2007
Posts: 261

Rep: Reputation: 16
bash script 'read' with default values


I have a fallowing simple bash script:
Code:
#!/bin/bash

echo -n "Please insert your name: "
read NAME

echo -n "Please enter your sex(m or f, default is m): "
read SEX

echo -n "Please enter your hometown(default is New-York): "
read TOWN
echo
echo
echo name: $NAME
echo sex: $SEX
echo hometown: $TOWN
It works fine, but is it possible to have default values using bash read(1b)? I mean if user is prompter for sex, he just pushes ENTER and by default 'm' is chosen. Or if user is prompted for hometown and he doesn't insert anything, but just pushes ENTER button, 'New-York' sis chosen by default Are such default values possible in bash?

Last edited by m4rtin; 03-05-2010 at 08:59 AM.
 
Old 03-05-2010, 09:06 AM   #2
carltm
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Registered: Jan 2007
Location: Canton, MI
Distribution: CentOS, SuSE, Red Hat, Debian, etc.
Posts: 697

Rep: Reputation: 93
Yes, after 'read SEX' add the line 'SEX="${SEX:=m}"' and after
'read TOWN' add 'TOWN=$"{TOWN:=New-York}"'

This syntax means to set the variable to its current value,
unless it is empty, in which case it will take the new value.
 
  


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