ls command
Meaning of this command: Displays a list of files and folders in the specified directory.
root@iZ259pk6ziaZ:/home# ls
haocai
Description: Displays files or folders in this directory.
wcjdeMBP:~ wcj$ ls -a
. .matplotlib Pictures
.. .mysql_history Public
.CFUserTextEncoding . Python27_compiled PycharmProjects
Description: Displays files or folders under this directory. (including hidden)
root@iZ259pk6ziaZ:/home# ls -l
total 4
drwxr-xr-x 4 root root 4096 Jun 20 17:30 haocai
Description: Displays the permissions, owner, size, timestamp, and file name of the files or folders in this directory.
root@iZ259pk6ziaZ:/home# ls -R
.:
haocai
. /haocai:
log skynet
./haocai/log:
skynet.log skynet.log.2016-05-26 skynet.log .2016-06-03 skynet.log.2016-06-13
./haocai/skynet:
account comment ingredient sample util.py
activity config menu search util.pyc
application.py cookrecord oplog static weixin
application.pyc database.py permission storage.py
cache.pyc database.pyc Push storage.pyc
categoryLatest feedback README.md templates
column firmware requirements.txt user
./haocai/skynet/account:
__init__.py __init__.pyc module.py module.pyc view.py view.pyc
Description: Display files or folders under this directory and subdirectories
root@iZ259pk6ziaZ:/home# ls -lR
.:
total 4
drwxr-xr-x 4 root root 4096 Jun 20 17:30 Haocai
./haocai:
total 8
drwxr-xr-x 2 root root 4096 Jun 14 2 0:06 log
drwxr-xr-x 22 root root 4096 Jun 15 16:42 skynet
./haocai/log:
total 128
-rw-r--r-- 1 root root 102387 Jun 15 16:30 skynet.log
-rw-r--r-- 1 root root 9668 Jun 3 17 :14 skynet.log.2016-05-26
-rw-r--r-- 1 root root 661 Jun 13 10:47 skynet.log.2016-06-03
-rw-r--r-- 1 root root 9528 Jun 15 09:52 skynet.log.2016-06-13
Description: The combination of -l and -R, with both commands Function
cat command
Meaning of this command: Display the contents of the file.
root@iZ259pk6ziaZ:/# cat text1.txt
2016-01
2016-02
2016-03< Br>
Description: Display the entire contents of the file
root@iZ259pk6ziaZ:/# cat >text4.txt
Description: Create file 4
root@iZ259pk6ziaZ:/# cat -n text1.txt>text2.txt
: Pass the contents and line number of file 1 to file 2, if 2 does not exist, create it. If there is no > point to file 2, file 2 must exist
root@iZ259pk6ziaZ: /# cat >>text1.txt<
> 2016-01
> 2016-01
> 2016-03
> EOF
Description: Create file 1 and input the content, EOF can be replaced with any of the same characters
head command
Meaning of this command: Display file header information.
root@iZ259pk6ziaZ:/# head text1.txt
2016-01
2016-02
2016-03< Br>
2016-04
2016-05
2016-06
2016-07
2016-08
2016-09
2016-10
Description: Display the first 10 lines of file 1 (default)
root@iZ259pk6ziaZ:/# head -5 text1.txt
2016-01
2016-02
2016-03
2016-04
2016-05
Description: Displays the first 5 lines of information in file 1.
root@iZ259pk6ziaZ:/# head -n -10 text1.txt
2016-01
2016-02
Description: Display file 1 Remove the last 10 lines of information.
2016-0root@iZ259pk6ziaZ:/# head -c 12 text1.txt
2016-01
2016
: Displays information about the first 12 bytes of file 1.
2016-root@iZ259pk6ziaZ:/# head -c -74 text1.txt
2016-01
2016-02
2016-0
Description: Display file 1 removes the last 74 bytes of information.
tail Command
Meaning of this command: Display file tail information.
root@iZ259pk6ziaZ:/# tail text1.txt
2016-03
2016-04
2016-05< Br>
2016-06
2016-07
2016-08
2016-09
2016-10
2016-11
2016-12
Description: Display 10 lines of information at the end of file 1 (default)
root @iZ259pk6ziaZ:/# tail -5 text1.txt
2016-08
2016-09
2016-10
2016-11
2016-12
Description: Displays the last 5 lines of information in file 1.
root@iZ259pk6ziaZ:/# tail -n +11 text1.txt
2016-11
2016-12
Description: Displays all information from file 1 to the end of line 1.
root@iZ259pk6ziaZ:/# tail -f text1.txt
2016-03
2016-04
2016- 05
2016-06
2016-07
2016-08
2016-09
2016-10
2016-11
2016-12
Description: Cycle through all the information of file 1. (Dynamic real time)
wc command
Meaning of this command: Count the number of lines, words, and subsections in the specified file.
root@iZ259pk6ziaZ:/# wc -l text1.txt
12 text1.txt
Description: Displays the number of lines in file 1.
root@iZ259pk6ziaZ:/#wc -w text1.txt
12 text1.txt
Description: Displays the number of words in file 1.
root@iZ259pk6ziaZ:/# wc -c text1.txt
96 text1.txt
Description: Displays the number of bytes in file 1.
root@iZ259pk6ziaZ:/# wc text1.txt
12 12 96 text1.txt
Description: Display -l,-w,- c function
root@iZ259pk6ziaZ:/# wc -m text1.txt
96 text1.txt
Description: Display the characters of file 1. number.
root@iZ259pk6ziaZ:/# wc -L text1.txt
7 text1.txt
Description: Display the longest line of file 1. length.
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