Commands by pipeliner (5)

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Watch how many tcp connections there are per state every two seconds.
slighty shorter

Regenerate the /etc/mtab file

reverse order of file
awk reverse order of lines (emulates "tac")

find out how much space are occuipied by files smaller than 1024K
The command gives size of all files smaller than 1024k, this information, together with disk usage, can help determin file system parameter (e.g. block size) or storage device (e.g. SSD v.s. HDD). Note if you use awk instead of "cut| dc", you easily breach maximum allowed number of records in awk.

find and replace tabs for spaces within files recursively

Grep auth log and print ip of attackers
Work for me on CentOS, grep and print ip addresses of ssh bruteforce attempts

Insert a comment on command line for reminder
Comments can be used directly on the command line so I can save in the history a brief description of what command does.

find the process that is using a certain port e.g. port 3000

Backup all MySQL Databases to individual files

move a lot of files over ssh
copy files to a ssh server with gzip compression


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