i is a variable, as in basic:
for i = 1 to 10 : next i
c/perl/java:
for(i=1; i<=10; i++) ;
bash
for (( i=1; i<=10; i++ )) ; do echo $i ; done
or when we are using text instead of integers, i is a word seperated by
spaces.
integers="1 2 3 4 5 6 7 8 9 10"
for i in $integers ; do
printf "%2d\n" $i
done
1
2
3
4
5
6
7
8
9
10
similarly you can say:
for justin in `date` ; do
echo $justin
done
Tue
Aug
14
13:15:40
2001
i is merely a very common convention for simple for loops across many
languages.
The seperator ' ' (space) is setable. From `man bash`:
IFS The Internal Field Separator that is used for word
splitting after expansion and to split lines into
words with the read builtin command. The default
value is ``<space><tab><newline>''.
-----Original Message-----
From: Justin Bengtson [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 14, 2001 1:02 PM
To: '[EMAIL PROTECTED]'
Subject: [EUG-LUG:2195] RE: BASH question
mos' definitely. what exactly does "i" represent? from what i'm reading
here (and what cory told me in-office) it seems to be a word between spaces.
if so, that's exactly what i'm looking for.
the expression below doesn't look complete... "for i in $(DATE); do"
should there be a "each" in the statement? or does the statement only act
on the first "i"? or does it not need an "each" because it's implied?
sorry, but i'm confrused here. the man pages for BASH are horrible...
and thanks for the help!
-----Original Message-----
From: Jacob Meuser [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 14, 2001 1:06 PM
To: [EMAIL PROTECTED]
Subject: [EUG-LUG:2193] RE: BASH question
On Tue, Aug 14, 2001 at 11:59:52AM -0700, Cory Petkovsek wrote:
> var=`date` ; echo $var
> Tue Aug 14 11:58:46 2001
>
> Multiple results? Please define.
>
Maybe he's thinking of something like this: (not tested with bash, but
should work)
#!/bin/sh
DATE=`date`
for i in ${DATE}; do
case ${i} in
Mon) echo "It's Monday" ;;
Tue) echo "It's Tuesday" ;;
PST) echo "Pacific Standard Time" ;;
PDT) echo "Daylight savings in effect" ;;
esac
done
--
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