Commands by jianingy

Commands by jianingy (9)

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generate a telephone keypad

seems a useless command ... Show Sample Output
This is sample output - yours may be different.
```
1	2	3
4	5	6
7	8	9
*	0	#
```
1

echo {1..9} '* 0 #' | tr ' ' '\n' |paste - - -

jianingy · 2014-12-27 09:38:36 8
A random password generator
This is sample output - yours may be different.
0

tr -dc '\x15-\x7e' < /dev/urandom| head -c 16 | paste

jianingy · 2014-08-19 06:37:15 8
find broken symbolic links

== remove broken links == find -L . -type l -exec rm -rf {} \; == how this work == "symbolic link; this is never true if the -L option or the -follow option is in effect, unless the symbolic link is broken. If you want to search for symbolic links when -L is in effect, use -xtype." -- manpage of find.
This is sample output - yours may be different.
8

find -L . -type l

jianingy · 2010-07-23 06:32:41 9
download with checksum

other options: * replace md5sum with sha1sum for SHA1 checksum * replace '>' with '| tar zx' for extracting tarball Show Sample Output
This is sample output - yours may be different.
```
$ wget -qO - http://www.google.com | tee >(md5sum) > /tmp/index.html
9e1f929ea8ffcd508d1fb412cd1abf38  -
```
0

wget -qO - http://www.google.com | tee >(md5sum) > /tmp/index.html

jianingy · 2010-07-23 06:29:29 5
generate random mac address
This is sample output - yours may be different.
2

2>/dev/null dd if=/dev/urandom bs=1 count=6 | od -t x1 | sed '2d;s/^0\+ //;s/ /:/g'

jianingy · 2010-04-30 00:44:21 43
ssh tunnel with auto reconnect ability
This is sample output - yours may be different.
13

while [ ! -f /tmp/stop ]; do ssh -o ExitOnForwardFailure=yes -R 2222:localhost:22 target "while nc -zv localhost 2222; do sleep 5; done"; sleep 5;done

jianingy · 2009-02-08 12:45:43 19
find the difference between two nodes
This is sample output - yours may be different.
6

diff <(ssh nx915000 "rpm -qa") <(ssh nx915001 "rpm -qa")

jianingy · 2009-02-08 12:41:25 12
run command on a group of nodes in parallel
This is sample output - yours may be different.
1

echo -n m{1..5}.cluster.net | xargs -d' ' -n1 -P5 -I{} ssh {} 'uptime'

jianingy · 2009-02-08 12:34:04 16
Extract tarball from internet without local saving
This is sample output - yours may be different.
73

wget -qO - "http://www.tarball.com/tarball.gz" | tar zxvf -

jianingy · 2009-02-08 12:22:54 45

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Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Trace and view network traffic

Trace and view network traffic. I made this far too complicated.. now fixed, thanks zolden.

show the difference

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

uniq without pre-sorting

Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.

Install pip with Proxy

Installs pip packages defining a proxy

Download an Entire website with wget

Get your Firefox bookmarks

Extracts yours bookmarks out of sqlite with the format: dateAdded|url

Retrieve "last modified" timestamp of web resource in UTC seconds

This command line assumes that "${url}" is the URL of the web resource. It can be useful to check the "freshness" of a download URL before a GET request.

Install a new kernel in Manjaro linux

00 is the number of the linux kernel e.g. linux39

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