Author Archives: vicki

#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

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

Watch disk usage updating every 3 seconds:watch -d -n 3 ‘df -h’

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 →

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

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

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

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 →

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 →