Difference between revisions of "Linux cli snippets"

From DevOps Notebook
 
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=== Check ssl expiry date from linux cli ===
 
=== Check ssl expiry date from linux cli ===
 
<pre>
 
<pre>
# echo | openssl s_client -showcerts -servername cdn5.motherlessmedia.com -connect cdn5.motherlessmedia.com:443 2>/dev/null | openssl x509 -inform pem -noout -text |grep 'Not After'
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# echo | openssl s_client -showcerts -servername devopsnotebook.com -connect devopsnotebook.com:443 2>/dev/null | openssl x509 -inform pem -noout -text |grep 'Not After'
 
</pre>
 
</pre>
  
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<pre>
 
<pre>
 
# find ./ -type f -exec sed -i -e 's/tomato/potato/g' {} \;
 
# find ./ -type f -exec sed -i -e 's/tomato/potato/g' {} \;
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</pre>
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=== Destroy all partitions table and data on drive ===
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<pre>
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# sgdisk --zap-all /dev/nvme0n1
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</pre>
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=== Push dns changes to secondary ===
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<pre>
 +
# rndc retransfer domain.com
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</pre>
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=== Delete 5 lines after a pattern with sed (including the line with the pattern) ===
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<pre>
 +
# sed -e '/pattern/,+5d' file.txt
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</pre>
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=== Delete 5 lines after a pattern with sed (excluding the line with the pattern) ===
 +
<pre>
 +
# sed -e '/pattern/{n;N;N;N;N;d}' file.txt
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</pre>
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=== User iperf to test real bandwidth speed ===
 +
<pre>
 +
# iperf -s # run on first machine
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# iperf -c <IP of server> # run on second with ip of first one
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</pre>
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=== Get only first exact result from grep ===
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<pre>
 +
# grep -o -a -m 1 -h -r "string" <filename.txt>
 
</pre>
 
</pre>

Latest revision as of 12:49, 14 September 2022

Linux command line snippets

Get website SSL certificate details using CLI

$ echo | openssl s_client -showcerts -servername sendfileto.net -connect sendfileto.net:443 2>/dev/null | openssl x509 -inform pem -noout -text

Temporary stop bash history

Turn off:

$ set +o history

Turn on:

$ set -o history

Alternative is to add HISTCONTROL="ignorespace" into .bashrc file and all things written with space in front wont be recorded in history

Check ssl expiry date on file from cli

# openssl x509 -noout -dates -in /path/to/cert.crt

Check ssl expiry date from linux cli

# echo | openssl s_client -showcerts -servername devopsnotebook.com -connect devopsnotebook.com:443 2>/dev/null | openssl x509 -inform pem -noout -text |grep 'Not After'

Start all vm's with autostart set with virsh

# for i in $(virsh list --name --autostart); do virsh start $i; done

Sort files by size with ls

# ls -l -S | sort -k 5 -n

Change different permissions to files and folders in one run recursively

# find /path/to/dir -type f -exec chmod 664 {} + -o -type d -exec chmod 775 {} +

Search and replace string in all files recursively in given folder

# find ./ -type f -exec sed -i -e 's/tomato/potato/g' {} \;

Destroy all partitions table and data on drive

# sgdisk --zap-all /dev/nvme0n1

Push dns changes to secondary

# rndc retransfer domain.com

Delete 5 lines after a pattern with sed (including the line with the pattern)

# sed -e '/pattern/,+5d' file.txt

Delete 5 lines after a pattern with sed (excluding the line with the pattern)

# sed -e '/pattern/{n;N;N;N;N;d}' file.txt

User iperf to test real bandwidth speed

# iperf -s # run on first machine 
# iperf -c <IP of server> # run on second with ip of first one

Get only first exact result from grep

# grep -o -a -m 1 -h -r "string" <filename.txt>