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Show time and date when you installed your OS.
Little faster alternative.
Umask is obtained subtracting 7 from each cypher of octal format. I store octal perm format in an array,then for each element of array I subtract 7. The result is the umask.
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
% = buffer
d = delete
$ time perl -e 'if(opendir D,"."){@a=readdir D;print $#a - 1,"\n"}'
205413
real 0m0.497s
user 0m0.220s
sys 0m0.268s
$ time { ls |wc -l; }
205413
real 0m3.776s
user 0m3.340s
sys 0m0.424s
*********
** EDIT: turns out this perl liner is mostly masturbation. this is slightly faster:
$ find . -maxdepth 1 | wc -l
sh-3.2$ time { find . -maxdepth 1|wc -l; }
205414
real 0m0.456s
user 0m0.116s
sys 0m0.328s
** EDIT: now a slightly faster perl version
$ perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"'
sh-3.2$ time perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"'
205414
real 0m0.415s
user 0m0.176s
sys 0m0.232s
Some command names are very different from the name of the package that installed them.
Sometimes, you may want to find out the name of the package that provided a command on a system, so that you can install it on another system.
This is regarding the command 8263 using an alias to fill in command line options for psql.
You can actually just type 'psql'. In order for that to work, you want to set environment variables PGDATABASE, PGHOST, PGUSER, and (except you're using the default) PGPORT. Also, you can add a line "host:port:dbname:user:password" (asterisk ok in some columns) to your ~/.pgpass file. Finally, if you don't like the aligned columns, you can add the line "\pset format unaligned" to your ~/.psqlrc file.
count the times a domain appears on a file which lines are URLs in the form http://domain/resource.
It finds, specifically, the connections to the HTTP and HTTPS ports as source ports. You can check for destination ports as well.