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Category Archives: Linux
Track cpu stats
#Run iostat to get the average cpu usage every 10 seconds for 10 times:iostat -x 10 10 >> /home/<user>/iostat.out.$(date +”%Y-%m-%d”) #Run dstat to get cpu stats for cpus 1, 3 and the total:dstat -C 0,3,total
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The top/htop command(s)
To run top in batch mode (updating every 3 seconds) and write it to a file in my directorytop -b -d 10 -n 3 >> /home/<user>/top-file
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Using the watch command
Watch disk usage updating every 3 seconds:watch -d -n 3 ‘df -h’
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Useful Sed strings to use in Vim
To delete lines 4-12 in Vim: :4,12 d To replace the word foo with the word bar starting at the line where the cursor is through the end of the file: :.,$s/foo/bar/ To remove the spaces in the middle of … Continue reading
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Tarring and passwording a directory
Tar and encrypt: tar cz <dir>/ | openssl enc -aes-256-cbc -pbkdf2 -iter 10000 -e > out.tar.gz.enc Decrypt:openssl enc -aes-256-cbc -d -in out.tar.gz.enc | tar xz
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Determine which SSL Ciphers are running on your site
To determine which SSL Ciphers your site supports, you can run this (rather intrusive) nmap command:nmap -sV –script ssl-enum-ciphers -p 443 <hostname> From the command line on the server, you can run this command:sslscan -show-ciphers <hostname>:443
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Determine the Number of Cores on a VM
Since RedHat/Ubuntu/Debian’s /proc/cpuinfo has a separate entry for each CPU core, you can use this command to count them:cat /proc/cpuinfo | grep processor | wc -l
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Convert UTF-8 to UTF-16
To convert a UTF-8 encoded file to UTF-16, you can use iconv on the command line: iconv -f utf-8 -t utf-16 oldfile > newfile
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SSL Tunneling
To connect to MySQL through a tunnel Open a tunnel on your local machine listening on localhost:3307 and forwarding everything to the mysqlserver server on port 3306, and doing it all via the ssh service on the gateway machine. ssh … Continue reading
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OpenSSH Legacy Options
If you are using an updated openssh package and suddenly can’t connect to sites that you could before the update, you can add an option to your .ssh/config file (create it if you don’t have one). If you see this … Continue reading
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