Commands by krizzo

Commands by krizzo (11)

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Edit a single line in multiple files with sed

Find and replace specific characters in a single line in multiple files with sed. Show Sample Output
This is sample output - yours may be different.
```
Original file
file1.txt:This is the MATCHING STRING and ORIGINAL some more text

Replaced file

file1.txt:This is the MATCHING STRING and REPLACEMENT some more text
```
-1

for f in `ls`; do sed -i '/MATCHING STRING/ { s/ORIGINAL/REPLACEMENT/; }' ${f} ; done

krizzo · 2015-05-21 19:37:42 2
Extract public key from private

This will extract the public key that is stored in the private key using openssl. Show Sample Output
This is sample output - yours may be different.
```
writing RSA key
```
2

openssl rsa -in key.priv -pubout > key.pub

krizzo · 2015-04-28 19:10:17 1
Get number of established sessions on a given port

This counts all established sessions on port 80. You can change :80 to any port number you want to check. Show Sample Output
This is sample output - yours may be different.
```
20
```
-2

netstat -anp | grep :80 | grep ESTABLISHED | wc -l

krizzo · 2015-04-10 19:32:31 3
Delete all local git branches that have been merged

This checks if the branch has been merged with master and then will delete the ones that have been. Keeps your local git repo nice and clean from all the branches. Show Sample Output
This is sample output - yours may be different.
```
-->git branch
  <BRANCH_NAME_1>
  <BRANCH_NAME_2>
  <BRANCH_NAME_3>
  <BRANCH_NAME_4>
* master


-->git branch --merged | grep -v "\*" | xargs -n 1 git branch -d
Deleted branch <BRANCH_NAME_1> (was f1b26d6).
Deleted branch <BRANCH_NAME_2> (was 5809506).
Deleted branch <BRANCH_NAME_3> (was 8e89287).
```
3

git branch --merged | grep -v "\*" | xargs -n 1 git branch -d

krizzo · 2015-01-25 00:30:37 0
Generate SSH key

This is just a default ssh-keygen command. Prompts for a password that you can use to secure the keys more and uses a higher bit value than the default along with naming the key something other than id_rsa for better file identification.
This is sample output - yours may be different.
0

ssh-keygen -t rsa -b 4096 -f ~/.ssh/<ROLE>_rsa -C "Comment goes here"

krizzo · 2015-01-11 17:52:21 0
Remove a specific gpg-pubkey from rpm/yum

This will remove the gpg-pubkey-1aa043b8-53b2e946 from rpm/yum and you'll be prompted to add it back from the given repo. Show Sample Output
This is sample output - yours may be different.
```
[NO OUTPUT]
```
0

rpm -e --allmatches gpg-pubkey-1aa043b8-53b2e946

krizzo · 2014-12-09 21:27:08 0
List all gpg-pubkeys for yum

This will list all the gpg keys that were accepted and installed for yum. Show Sample Output
This is sample output - yours may be different.
```
1aa043b8-53b2e946 gpg(Foreman Automatic Signing Key (2014) <packages@theforeman.org>)
0608b895-4bd22942 gpg(EPEL (6) <epel@fedoraproject.org>)
c105b9de-4e0fd3a3 gpg(CentOS-6 Key (CentOS 6 Official Signing Key) <centos-6-key@centos.org>)
4bd6ec30-4ff1e4fa gpg(Puppet Labs Release Key (Puppet Labs Release Key) <info@puppetlabs.com>)
```
0

rpm -qa gpg-pubkey --qf "%{version}-%{release} %{summary}\n"

krizzo · 2014-12-09 21:23:28 0
List only X byte files in the current directory

This will list all the files that are a gigabyte or larger in the current working directory. Change the G in the regex to be a M and you'll find all files that are a megabyte up to but not including a gigabyte. Show Sample Output
This is sample output - yours may be different.
```
1.8G	Desktop
4.9G	Documents
3.7G	Google Drive
1.4G	Library
 37G	VirtualBoxVMs
8.7G	src
```
0

du -hs * |egrep -i "^(\s?\d+\.?\d+G)"

krizzo · 2014-12-09 15:23:21 1
Display all zombie process IDs

This prints out a list of all zombie processes PIDs so you can do things like kill the zombies Show Sample Output
This is sample output - yours may be different.
```
$ ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'
4661
5084
7456
10502
16713
19095
24115
29544
```
0

ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'

krizzo · 2014-11-26 21:29:33 0
Use grep to get multiple patterns.

Using egrep to search multiple patterns. Show Sample Output
This is sample output - yours may be different.
```
ERROR: This is an error message.
CRITICAL: This is a critical message.
WARNING: This is a warning message.
```
0

egrep -wi --color 'warning|error|critical'

krizzo · 2014-10-07 17:06:39 0
Sort content of a directory including hidden files.

This command sorts the content including hidden files in human readable format of the current directory. Show Sample Output
This is sample output - yours may be different.
```
/etc/pki/tls#
0	cert.pem
8.0K	private
12K	openssl.cnf
28K	misc
1.2M	certs
1.3M	total
```
1

du -sch .[!.]* * |sort -h

krizzo · 2014-07-17 21:45:46 0

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Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

[vim] Clear trailing whitespace in file

% acts on every line in the file. \s matches spaces. \+ matches one or more occurrences of what's right behind it. Character '$' matches end-of-line.

relabel current konsole tab

usage: renam in a script you must replace $PPID with $(awk '{print $4}' /prod/$PPID/stat)

Rename files in batch

for too many arguments by *

$ grep ERROR *.log -bash: /bin/grep: Argument list too long $ echo *.log | xargs grep ERROR /dev/null 20090119.00011.log:DANGEROUS ERROR

Remove a range of lines from a file

Open Remote Desktop (RDP) from command line having a custom screen size

This example uses xfreerdp, which builds upon the development of rdesktop. This example usage will also send you the remote machine's sound.

Calculate pi with specific scale

a() function in bc is for arctangent, available if using -l option included.

Create a tar of directory structure only

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

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