Commands by brx75x

Commands by brx75x (6)

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Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)

If your `date` command has `-r` option, you don't need `stat`
This is sample output - yours may be different.
3

cp file{,.$(date -r file "+%y%m%d")}

brx75x · 2019-09-19 09:42:38 14
Grep live log tailing
This is sample output - yours may be different.
0

tail -F some_log_file.log | grep --line-buffered the_thing_i_want

brx75x · 2018-01-24 09:54:36 4
ShellCheck all the bash/sh script under a specific directory excluding version control

This is a commodity one-liner that uses ShellCheck to assure some quality on bash and sh scripts under a specific directory. It ignores the files in .git directory. Just substitute "./.git/*" with "./.svn/*" for older and booring centralized version control. Just substitute ShellCheck with "rm" if your scripts are crap and you want to get rid of them :)
This is sample output - yours may be different.
5

find . -type f ! -path "./.git/*" -exec sh -c "head -n 1 {} | egrep -a 'bin/bash|bin/sh' >/dev/null" \; -print -exec shellcheck {} \;

brx75x · 2017-03-16 08:43:56 7
Prefix every line with a timestamp
This is sample output - yours may be different.
1

any command | sed "s/^/\[`date +"%Y%m%d%H%M%S"`]/"

brx75x · 2014-02-10 16:18:51 3
encode HTML entities

Encode HTML entities supporting UTF-8 input and output
This is sample output - yours may be different.
0

perl -MHTML::Entities -ne 'print encode_entities($_)' /tmp/subor.txt

brx75x · 2012-10-11 08:31:14 0
Create a continuous digital clock in Linux terminal

Same effect, only shell commands. Show Sample Output
This is sample output - yours may be different.
```
15:25:31
```
1

while [ 1 ] ; do echo -en "$(date +%T)\r" ; sleep 1; done

brx75x · 2012-10-01 13:25:49 0

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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"

Grep without having it show its own process in the results

The trick here is to use the brackets [ ] around any one of the characters of the grep string. This uses the fact that [?] is a character class of one letter and will be removed when parsed by the shell. This is useful when you want to parse the output of grep or use the return value in an if-statement without having its own process causing it to erroneously return TRUE.

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"

Cheap iftop

Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates. If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080".

create iso image from a directory

create iso image from directory . Usefull for virtualised machine To create CD ISO image of directories that contain long file name or non-8.3 format (particularly if you want to burn the CD image for use in Windows system), use the -J option switch that generates Joliet directory records in addition to regular iso9660 file names. For example, to create CD image of Vista SP1 directory: mkisofs -o VitaSP1.iso -J VistaSP1

get the latest version

to download latest version of "util", maybe insert a sort if they wont be shown in right order. curl lists all files on mirror, grep your util, tail -1 will gets the one lists on the bottom and get it with wget

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"

Extract .tar.lzma archive

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"

Get all IPs via ifconfig

Fetches the IPs and ONLY the IPs from ifconfig. Simplest, shortest, cleanest. Perl is too good to be true... (P.S.: credit should go to Peteris Krumins at catonmat.net)

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