Re: Any one know how to use select command ??
From: Dan Mercer (dmercer_at_mn.rr.com)
Date: 10/01/05
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Date: Sat, 01 Oct 2005 18:05:57 GMT
<ebrahimbandookwala@gmail.com> wrote in message news:1128148992.245295.114420@g43g2000cwa.googlegroups.com...
: Hi
: I am now posting the entire shell script
:
: #!/bin/ksh
:
: set -A Array #for holding entire file
: set -A flight #for holding individual items
: set -A tail
: set -A price
: set -A seats
: set -A first
: set -A business
:
: typeset -i C=0
: typeset -F price=0 #for reading price
:
: iep -E > data
: exec 0<data
:
:
: while getopts t: OPT
:
: do
:
: case $OPT in
: t) thresh=$OPTARG;; #threshold
: *) print "kdata2 -t [threshold] " # for price only
: exit 1;;
:
: esac
: done
:
: space="|" # custom delim
:
: while read flight tail price_e seats first bus
: do
: if [[ $price_e < $thresh ]]
Someone else has addressed your first problem - that you've redirected select's
stdin to your file. Since you are using "typeset -F" I will assume you are
using ksh93 and not pdksh or ksh88. in which case you can read data
directly into an array.
BTW, the above won't do what you think it does. [[ A < B ]] does a
left to right lexicographical comparison of two values:
$ [[ 20 < 3 ]] && echo ok
ok
$ typeset -F a=10.3 b=2.45
$ [[ $a < $b ]] && echo ok
ok
$ [[ $a -lt $b ]] || echo ok
ok
Either use [[ a -lt b ]] or ((a<b))
Also, you can use the output field separator to place your own delimiter
in a string construct from array elements. The ofs is the first character in
the IFS.
$ set -- 1 2 3 4 5
$ set -A A -- a b c d e f
$ IFS="|$IFS";echo "$*";echo "${A[*]}";IFS=${IFS#?}
1|2|3|4|5
a|b|c|d|e|f
The $* or ${array[*]} must be located in double quotes for an echo or print
statement, although a straight assignment does not require quotes.
$ set -- 1 2 3 4 5
$ IFS="|$IFS";x=$*;IFS=${IFS#?}
$ echo $x
1|2|3|4|5
You can also concatenate array elements by setting IFS= to null. In that case
you must save off the value of IFS.
IFS can be typeset local to function calls. Since it's dangerous to play with, I usually do it
in functions so I don't have to worry about resetting it:
(ksh88)
function concat
{
typeset vname=${1:?VNAME required}IFS=
shift
eval $vname='$*'
}
(ksh93)
function concat
{
typeset -n vname=${1:?VNAME required}
typeset IFS=
shift
vname=$*
}
Of course you could easily modify this simple function to concatenate
using any character:
function concat
{
typeset -n vname=${1:?VNAME required}
typeset IFS=${2?Delimiter required - may be null}
shift
vname=$*
}
Then you could call it as:
concat PATH ":" /usr/bin /usr/local/bin /usr/X11/bin
or
concat XYZ '' 1 2 3 4 5
Dan Mercer
: then
:
:
: Array[C]=$flight$space$tail$space$price_e$space$seats$space$first$space$bus$space
: #delim seperated values for select
: flight[C]=$flight
: tail[C]=$tail
: price[C]=$price_e
: seats[C]=$seats
: first[C]=$first
: business[C]=$bus
: fi
: ((C=C+1))
:
:
: done
:
: select option in "${Array[@]}"
: do
: echo $option
:
: for i in ${Array[@]}
: do
: C=0
: if [[ $option = ${Array[C]} ]]
: then
:
: echo ${flight[C]}
: fi
: done
: done
:
:
:
: Now the contents of
:
: iep -E > data
:
: JetBlue jb1000 120.339996 300 0 0
: Airtran at2002 230.339996 500 50 50
: BA ba1234 0 500 10 15
:
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