BEAUTY AND PLAY
$cat test.pl use strict; use File::Rename (); use Pod::Usage; main() unless caller; sub main { my $options = File::Rename::Options::GetOptions or pod2usage; mod_version() if $options->{show_version}; pod2usage( -verbose => 2 ) if $options->{show_manual}; pod2usage( -exitval => 1 ) if $options->{show_help}; @ARGV = map {glob} @ARGV if $^O =~ m{Win}msx; File::Rename::rename(\@ARGV, $options); } sub mod_version { print __FILE__ …
Continue reading “fold: Wrap input lines to fit in specified width”
$kill -l 1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM 16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP 21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ 26) SIGVTALRM 27) …
Continue reading “GNU coreutils: signal specifications . commands “kill” and “nohup””
ABOUT df df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls. [bash] $df Filesystem 1K-blocks Used Available Use% Mounted on udev 1921644 …
Continue reading “GNU coreutils: block size related to df command”
$cd test-folder/ $>1 $>2 $>3 $ls 1 2 3 $cd .. $>1 $>2 $cp -b 1 test-folder/ $cd test-folder/ $ls 1 1~ 2 3 $cd .. $export SIMPLE_BACKUP_SUFFIX=bc $cp -b 2 test-folder/ $cd test-folder/ $ls 1 1~ 2 2bc 3 $cd .. $export SIMPLE_BACKUP_SUFFIX=.bc $cp -b 2 test-folder/ $cd test-folder/ $ls 1 1~ 2 2bc …
Continue reading “GNU coreutils : backup option related to cp command”
$echo “hello” > –test $cat –test cat: unrecognized option ‘–test’ Try ‘cat –help’ for more information. $cat — –test hello $