Perl display and pass command ling arguments with @argv
Q. How do I read or display command-line arguments with Perl?
A. Perl command line arguments stored inn the special array called @ARGV.
ARGV example
Use $ARGV[n] to display argument.
Use $#ARGV to get total number of passed argument to a perl script.
For example if your scriptname is foo.pl and you called script as follows:
./foo.pl one two three
You can print one, two, three command line arguments with print command:
print "$ARGV[$0]\n";
print "$ARGV[$1]\n";
print "$ARGV[$2]\n";
Or just use a loop to display all command line args:
#!/usr/bin/perl -w
foreach $num (0 .. $#ARGV) {
print "$ARGV[$num]\\n";
}
Here is an example (download link):
#!/usr/bin/perl -w
if ($#ARGV != 2 ) {
print "usage: mycal number1 op number2\neg: mycal 5 + 3 OR mycal 5 - 2\\n";
exit;
}
$n1=$ARGV[0];
$op=$ARGV[1];
$n2=$ARGV[2];
$ans=0;
if ( $op eq "+" ) {
$ans = $n1 + $n2;
}
elsif ( $op eq "-"){
$ans = $n1 - $n2;
}
elsif ( $op eq "/"){
$ans = $n1 / $n2;
}
elsif ( $op eq "*"){
$ans = $n1 * $n2;
}
else {
print "Error: op must be +, -, *, / only\\n";
exit;
}
print "$ans\\n";
Save and run script as follows:
$ chmod +x mycal.pl
$ ./mycal.pl
$ ./mycal.pl 5 + 3
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~ Last updated on: March 20, 2007
November 23rd, 2007 at 1:58 pm
Hi,
i think u wrongly misspelled the spelling of line to ling in “Perl display and pass command ling arguments with @argv”