Linux common command learning record

　Brothers Linux training

, the editor has sorted out the commonly used Linux learning commands:

　　1 cp copy command

　　Parameters : -p file attributes are copied together

　　-r copy folder

　　-d soft chain information, etc. are copied together

　　-a is the abbreviation of -rdp

　　2 find file search Command

　　Common search by file name (exact search)

　　find /home -name xx.xx

　　common branch file name search (fuzzy match, support: ? (single character), * (multiple characters), [] (specific content in brackets match))

　　find /home -name "*.xx" all files ending

　　with

　　.xx Find /home -user sls0919 Find all files of user sls0919

　　Find /home -nouser Find no owner in the home directory Files (probably junk files) find /home -size +25k

　　according to the file size Find files

　　larger than 25k in the home directory (plus sign means greater than, minus sign means less than, no symbol means equal) Find 　　/home

　　according to the file date

-mtime +25 Find files modified 25 days ago in the home directory (plus sign means greater than, minus sign means less than, no symbol means equal; mtime: content modification time, atime: access time, ctime: modification attribute time)

　　multi-condition search Connection symbols (a==and, o==or)

　　find /home -mtime +25 -a-size -25k Find files in the home directory that were modified 25 days ago and whose size is less than 25k

　　find /home -mtime +25 -o -size-25k Find the content modified 25 days ago in the home directory Or files with a size less than 25k After

　　querying the results and executing the operation command (-exec {}\;)

　　find /home -mtime +25 -a-size -25k -exec ls -lh {}\; List 25 days in the home directory Details of files whose content was previously modified and whose size is less than 25k

　　3 grep text search command

　　-i ignore case

　　-v exclude the specified string

　　-c count the number of times the specified string is found

　　-n the output result shows the line number

　　grep -r 'test' * Search for files with 'test' line in the current directory and its subdirectories

　　grep -l -r 'test' * Search for files with 'test' line in the current directory and its subdirectories, but do not display matching lines, only display Matching files

　　grep -n 't[ae]st' data.txt Find test or tast information in the file data.txt (refer to regular expressions for details)

　　4 man and help Help commands

　　man ls

　　ls --help

　　5 zip, gzip, bzip2, tar compression and decompression commands

　　zip compressed file name source file

　　-r compressed directory

　　Both gzip and bzip2 are compressed files and cannot be used for directories.

　　Common methods:

　　tar -cvf compressed file name source file source file source file can be multiple

　　-c compression

　　-x decompression

　　-v show the compression process

　　-f specify the packaged file name

　　-z Compress and decompress .tar.gz type files

　　-j compress and decompress .tar.bz2 type files