I used this fragment with Imagemagick convert so that I can place long text strings in pictures. The "\n" gets converted to a true newline in the image.

So this fragment uses fold command to wrap the line and then sed to convert newlines (and any trailing spaces on the line) to the text "\n"

After you run this script, you can check status for broken symlink with this command:

find -L . -type l

The leading plus sign is removed - Minus sign is left intact

usage = crontest "/path/to/bin"

This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix

Generates labyrinth-like pattern on UTF-8 terminal in bash.

For fun ;)

If you have a client that connects to a server via plain text protocol such as HTTP or FTP, with this command you can monitor the messages that the client sends to the server. Application level text stream will be dumped on the command line as well as saved in a file called proxy.txt.

You have to change 8080 to the local port where you want your client to connect to. Change also 192.168.0.1 to the IP address of the destination server and 80 to the port of the destination server.

Then simply point your client to localhost 8080 (or whatever you changed it to).

The traffic will be redirected to host 192.168.0.1 on port 80 (or whatever you changed them to).

Any requests from the client to the server will be dumped on the console as well as in the file "proxy.txt".

Unfortunately the responses from the server will not be dumped.

hypnotizing pendulum

Thanks to the great grml team for this func!

You really should look at their shell configs for further usefull things!

http://git.grml.org/?p=grml-etc-core.git;a=blob_plain;f=etc/grml/script-functions;h=4d6bcea8f9beae83abd08f44155d299ea54a4a9f;hb=HEAD

# {{{ check for availability of program(s)

# usage example:

# check4progs [-s,-q,--quiet,--silent] arg [arg .... argn]

#

# with option given either of:

# -s,-q,--quiet,--silent

#

# check for available progs but produce no output

check4progs() {

[ -n "${ZSH_VERSION}" ] && emulate -L sh

local RTN=0

local oldifs="${IFS}"

local ARG d found

local VERBOSE=1

case ${1} in

-q | -s | --quiet | --silent)

VERBOSE=0

shift 1

;;

*)

;;

esac

while [ $# -gt 0 ]

do

ARG="$1"

shift

found=0

IFS=:

for d in $PATH

do

if [ -x "${d}/${ARG}" ]

then

found=1

break

fi

done

IFS="${oldifs}"

# check for availability

if [ ${found} -eq 0 ]

then

if [ ${VERBOSE} -eq 1 ]

then

printf "%s: binary not found\n" "${ARG}" >&2

fi

RTN=1

fi

done

# return non zero, if at least one prog is missing!

return $RTN

}

# }}}

seems a useless command ...

Count how many times a pattern is present into a stream. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.

This is not exhaustive but after checking /etc/cron* is a good way to see if there are any other jobs any users may have set.

Note: this is a repost from a comment "flatcap" made on http://www.commandlinefu.com/commands/view/3726/print-crontab-entries-for-all-the-users-that-actually-have-a-crontab#comment, for which I am grateful and I take no credit.

This checks the system load every second and if it's over a certain threshold (.8 in this example), it spits out the date, system loads and top 4 processes sorted by CPU.

Additionally, the \a in the first echo creates an audible bell.

Easiest way to get the external IP address.

Google Cloud SDK comes with a package manager `gcloud components` but it needs a bit of `sed` to work. Modify the "^| Not" bit to change the package selection. (The gcloud --format option is currently broken)

Given a hosts list, ssh one by one and echo its name only if 'processname' is not running.

Monitoring system in one line :

DISK : disk space

MEM: memory ( mem , swap, Total)

CPU : all information about cpu activity

LOAD : load average

this command can be added to crontab so as to execute a nightly backup of directories and store only the 10 last backup files.

from: http://www.unix.com/shell-programming-and-scripting/28047-split-print-path.html