Process management command

init: Process number is 1

Classification of processes：
     the processes associated with the terminal
     Terminal independent process

1.process state：

     D： Non interrupted sleep
     R： Run or ready
     S： Interrupted sleep
     T： Stop it
     Z:  Zombie state

     <:  High priority process
     N： Low priority process
     +： Processes in the foreground process group
     l ...

The software is not installed in the default directory of the solution

1.Modify the PATH environment variable to be able to identify the binary file path for this program:

   modified /etc/profile
  In the /etc/profile.d/ directory, create a file with names ending in .sh suffix, which write the  "export PATH=$PATH:/path ...

File compression and Archive command summary

compressed format: gz, bz2, xz, Z, zip Compression algorithm: the algorithm is different, the compression ratio will be different;

1.gzip

gzip: .gz 
  gzip /PATH/TO/SOMEFILE: gzip will delete the original file after the completion of the compression
  gzip -d: decompression
       -#: 1-9, specify the compression ratio, the default ...

File Find command

1.locate:

Non-real-time, fuzzy matching, lookup is performed according to the system-wide file database；
# updatedb, Manually generated file database (fast)

2. find： Find PathFinder standard look to a future process of operation

Real-time, accurate, supports many search criteria, traversing all the files in the specified directory lookup completed, slow;

Search Path： The ...