Carlos A M S Teles carlos-teles

## gist:83e97c2b4869263035762af2380af6e9
These are for cases where you know that the directory contains only regular files and that you want to process all non-hidden files. If that is not the case, use the approaches in 2.

All sed solutions in this answer assume GNU sed. If using FreeBSD or macOS, replace -i with -i ''. Also note that the use of the -i switch with any version of sed has certain filesystem security implications and is inadvisable in any script which you plan to distribute in any way.

Non recursive, files in this directory only:

 sed -i -- 's/foo/bar/g' *
 perl -i -pe 's/foo/bar/g' ./*
(the perl one will fail for file names ending in | or space)).

## ruby proxy
gem install --http-proxy http://user:password@some.proxy.com:8080 bundler

## Oracle Instant Client on Debian or Ubuntu
apt-get install -y libaio1 alien
# Change version based on https://www.oracle.com/de/database/technologies/instant-client/linux-x86-64-downloads.html
# Example alternative: http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.5-basiclite-19.5.0.0.0-1.x86_64.rpm
wget http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.6-basic-19.6.0.0.0-1.x86_64.rpm
sudo alien -i --scripts oracle-instantclient*.rpm
rm -f oracle-instantclient*.rpm

# Optionally install SQLPlus
wget http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.6-sqlplus-19.6.0.0.0-1.x86_64.rpm
sudo alien -i --scripts oracle-instantclient*.rpm

## gist:1f33639037aefc6a0146c201275b6007

      
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                carlos-teles
                / gist:1f33639037aefc6a0146c201275b6007
            
            
              Created
              June 2, 2023 18:33
                — forked from Khoulaiz/gist:41b387883a208d6e914b
            
              
                Checking ports without telnet
              
          
    Here are several different ways to test a TCP port without telnet.
BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23


## gist:8ca1900930c8a5df1b17cdc026cda1a1
echo '<14>_sourcehost_ messagetext' | nc -v -u -w 2 _desthost_ 514

Example:
echo '<14>192.168.0.5 messagetext' | nc -v -u -w 2 192.168.0.105 514

## history uptime
.

## network attack
.

## cron
https://crontab.guru/

## dns
.

## cicd
.
	These are for cases where you know that the directory contains only regular files and that you want to process all non-hidden files. If that is not the case, use the approaches in 2.

	All sed solutions in this answer assume GNU sed. If using FreeBSD or macOS, replace -i with -i ''. Also note that the use of the -i switch with any version of sed has certain filesystem security implications and is inadvisable in any script which you plan to distribute in any way.

	Non recursive, files in this directory only:

	sed -i -- 's/foo/bar/g' *
	perl -i -pe 's/foo/bar/g' ./*
	(the perl one will fail for file names ending in \| or space)).
	apt-get install -y libaio1 alien
	# Change version based on https://www.oracle.com/de/database/technologies/instant-client/linux-x86-64-downloads.html
	# Example alternative: http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.5-basiclite-19.5.0.0.0-1.x86_64.rpm
	wget http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.6-basic-19.6.0.0.0-1.x86_64.rpm
	sudo alien -i --scripts oracle-instantclient*.rpm
	rm -f oracle-instantclient*.rpm

	# Optionally install SQLPlus
	wget http://yum.oracle.com/repo/OracleLinux/OL7/oracle/instantclient/x86_64/getPackage/oracle-instantclient19.6-sqlplus-19.6.0.0.0-1.x86_64.rpm
	sudo alien -i --scripts oracle-instantclient*.rpm
	echo '<14>_sourcehost_ messagetext' \| nc -v -u -w 2 _desthost_ 514

	Example:
	echo '<14>192.168.0.5 messagetext' \| nc -v -u -w 2 192.168.0.105 514