Perl GetoptPerl empty stringPerl if andPerl read filePerl input argumentPerl command line argumentsperl argv用法Perl empty string
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- 1Perl the swiss knife · Command Line Text Processing
passing argument to -l to set output record separator. $ seq 8 | perl -ne 'print if /[24]/' 2 4 $...
- 2Check For null Arguments - PerlMonks
A better way to check for particular value is defined or not, use defined function in perl. ... d...
- 3Establishing a Default Value - Perl Cookbook [Book] - O'Reilly
If 0 or "0" are valid values for your variables, use defined instead: ... If 0 is a valid value f...
- 4perl + identify if param is empty value from ARG - Stack Overflow
How to identify if $param is a null value or empty value, same as [ -z from ksh? #!/usr/bin/perl ...
- 5PERL -- Options
If there are no digits, the null character is the separator. ... If -e is given, perl will not lo...
