Linux practical commands

Linux practical commands

I hope to help you sort out some practical Linux commands.

1. Batch killing process:

Method 1:

Kill-9 'ps-ef | grep java | grep-v grep | awk' {print $2 }''

Method 2:

Ps-ef | grep java | grep-v grep | cut-c 9-15 | xargs kill-9

# Note: here we take killing java processes as an example.

Ii. Search for files:

1) list all empty files with a certain type of file names in the current directory (files with a size of 0 ):

Find.-name "ha_201212 * _ TM_2110015_00_001 * dat"-size 0 | xargs ls-l

2) Find a type of files in the current directory and back up the files to another directory:

Find.-name "ha_201212 * _ TM_2110015_00_001 * dat"-exec cp {}/home/goopand/data_bak/2110015 \;

Iii. Password validity period:

1) view the password validity period and other information:

Chage-l <username>

2) set the maximum password validity period to 90 days:

Chage-M 90 <username>

4. view the current logon User:

(Exclude duplicate user IDs and replace line breaks with commas)

Who | awk '{print $1}' | uniq | sort-u | xargs | tr-s ''','

Note: uniq is not required. The role of uniq: to exclude consecutive repetitions (the repetition of intervals cannot be ruled out ).

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