Commands by dave0

Commands by dave0 (2)

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Install the Debian-packaged version of a Perl module

Running 'cpan Module::Name' will install that module from CPAN. This is a simple way of using a similar command to install a packaged Perl module from a Debian archive using apt-get. Show Sample Output
This is sample output - yours may be different.
```
# dpan YAML::Tiny
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  libyaml-tiny-perl
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
Need to get 27.6kB of archives.
... etc, etc ...
```
1

function dpan () { PKG=`perl -e '$_=lc($ARGV[0]); s/::/-/g; print "lib$_-perl\n"' $1`; apt-get install $PKG; }

dave0 · 2009-03-12 15:39:38 13
Open Perl module source in your editor

Ever needed to look at the Perl source of an installed module on your system? This works in 90% of cases.
This is sample output - yours may be different.
3

$EDITOR `perldoc -l Module::Name`

dave0 · 2009-03-12 15:31:37 8

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Hide the name of a process listed in the `ps` output

$ exec -a $NAME $COMMAND $ARGS `your_cmd -erase_all_files` is the real process, but harmless-looking getty appears in the process table. Never actually had a need to do this, but interesting nonetheless... Tested in bash, dash. $ -a $NAME "pass NAME as the zeroth argument to COMMAND", i.e. customise the name of the process (as commonly seen with `ps`)

Reduce PDF size

Find the 20 biggest directories on the current filesystem

This command will tell you the 20 biggest directories starting from your working directory and skips directories on other filesystems. Useful for resolving disk space issues.

Check if *hardware* is 32bit or 64bit

CPU flags: rm --> 16-bit processor (real mode) tm --> 32-bit processor (? mode) lm --> 64-bit processor (long mode)

Check variable has been set

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

eth-tool summary of eth# devices

Give the Speed and Link status of eth# 0-3. This is sort of what mii-tool does, but eth-tool is better, yet lacks device discovery.

Simple top directory usage with du flips for either Linux or base Solaris

No need to type out the full OR clause if you know which OS you're on, but this is easy cut-n-paste or alias to get top ten directories by singleton. To avoid the error output from du -xSk you could always 2>/dev/null but you might miss relevant STDERR.

Grep inside Vim and navigate results

Will search for the given pattern and build a list of occurrences. Then you can use :copen and :cclose to toggle the list. When browsing the list, ENTER will take you to that line in the file.

Get IPv4 of eth0 for use with scripts

I've been using it in a script to build from scratch proxy servers.

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