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Shell Programming and Scripting

FQDN into domain name and hostname

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Top Forums Shell Programming and Scripting FQDN into domain name and hostname
# 8  
Old 10-10-2010
Quote:
Originally Posted by danmero
Code:
# cat script
#!/bin/sh
for i in ${@};do echo ${i};done

# /temp/script 1 2 3 4 5 6 7 8 9 10 11
1
2
3
4
5
6
7
8
9
10
11

Actually in this case $i does not contain an enumeration but the parameter values, so it isn't necessary to use curly brackets, but the quotes are necessary to capture arguments that contain space characters..
Code:
for i in "$@";do echo "$i";done

# 9  
Old 10-10-2010
Quote:
Originally Posted by cjcox
awk? Hmmm... I suppose. If portability is the goal (no bash, for example), then use expr or cut or even sed instead (IMHO).

Code:
#Split FQDN into hostname and domain
HOSTNAME=`expr "$7" : '\([^.][^.]*\)\..*'`
DOMAIN=`expr "$7" : '[^.][^.]*\.\(.*\)'`

Or use cut...

Code:
HOSTNAME=`echo "$7" | cut -f1 -d.`
DOMAIN=`expr "$7" | cut -f2- -d.`

or even sed... you're using sed to doctor things up anyhow...

Code:
HOSTNAME=`echo "$7" | sed  's/\..*//'`
DOMAIN=`expr "$7" | sed -n 's/[^.]*\.//p'`

Just my opinion... awk would be my last choice for this.
Code:
HOSTNAME=${7%%.*}
DOMAIN=${7#*.}

This User Gave Thanks to Franklin52 For This Post:
Neo
# 10  
Old 10-11-2010
Quote:
Originally Posted by Franklin52
Code:
HOSTNAME=${7%%.*}
DOMAIN=${7#*.}

As I said, and as you mentioned in your post, if you have bash, then it opens up more possibilities (that are even more efficient). It's just not portable, Bourne shell wise.
# 11  
Old 10-11-2010
Quote:
Originally Posted by cjcox
As I said, and as you mentioned in your post, if you have bash, then it opens up more possibilities (that are even more efficient). It's just not portable, Bourne shell wise.
This is portable with bash, ksh and all POSIX shells, on a SUN OS perhaps with /usr/xpg4/bin.
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