Full Discussion: Pad 0 to the right
Top Forums UNIX for Beginners Questions & Answers Pad 0 to the right Post 303042901 by RudiC on Friday 10th of January 2020 04:44:23 AM
Old 01-10-2020
Or
Code:
printf "%s%0*d\n" ${X} $((9-${#X})) 0
245700000
printf "%s%0$((9-${#X}))d\n" ${X}
245700000

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B::Showlex(3pm) 					 Perl Programmers Reference Guide					   B::Showlex(3pm)

NAME
B::Showlex - Show lexical variables used in functions or files SYNOPSIS
perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl DESCRIPTION
When a comma-separated list of subroutine names is given as options, Showlex prints the lexical variables used in those subroutines. Otherwise, it prints the file-scope lexicals in the file. EXAMPLES
Traditional form: $ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")' Pad of lexical names for comppadlist has 4 entries 0: SPECIAL #1 &PL_sv_undef 1: PVNV(0x9db0fb0) $i 2: PVNV(0x9db0f38) $j 3: PVNV(0x9db0f50) $k Pad of lexical values for comppadlist has 5 entries 0: SPECIAL #1 &PL_sv_undef 1: NULL(0x9da4234) 2: NULL(0x9db0f2c) 3: NULL(0x9db0f44) 4: NULL(0x9da4264) -e syntax OK New-style form: $ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")' main Pad has 4 entries 0: SPECIAL #1 &PL_sv_undef 1: PVNV(0xa0c4fb8) "$i" = NULL(0xa0b8234) 2: PVNV(0xa0c4f40) "$j" = NULL(0xa0c4f34) 3: PVNV(0xa0c4f58) "$k" = NULL(0xa0c4f4c) -e syntax OK New form, no specials, outside O framework: $ perl -MB::Showlex -e 'my ($i,$j,$k)=(1,"foo"); B::Showlex::compile(-newlex,-nosp)->()' main Pad has 4 entries 1: PVNV(0x998ffb0) "$i" = IV(0x9983234) 1 2: PVNV(0x998ff68) "$j" = PV(0x998ff5c) "foo" 3: PVNV(0x998ff80) "$k" = NULL(0x998ff74) Note that this example shows the values of the lexicals, whereas the other examples did not (as they're compile-time only). OPTIONS The "-newlex" option produces a more readable "name => value" format, and is shown in the second example above. The "-nosp" option eliminates reporting of SPECIALs, such as "0: SPECIAL #1 &PL_sv_undef" above. Reporting of SPECIALs can sometimes overwhelm your declared lexicals. SEE ALSO
B::Showlex can also be used outside of the O framework, as in the third example. See B::Concise for a fuller explanation of reasons. TODO
Some of the reported info, such as hex addresses, is not particularly valuable. Other information would be more useful for the typical programmer, such as line-numbers, pad-slot reuses, etc.. Given this, -newlex isnt a particularly good flag-name. AUTHOR
Malcolm Beattie, "mbeattie@sable.ox.ac.uk" perl v5.18.2 2014-01-06 B::Showlex(3pm)

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