Article Directory
sort command
Overview
- The sort command is used to sort the contents of a file and print the sorting result to standard output
- It treats each line of the file as a unit and sorts the content of the file by line unit
- It can also be sorted according to different data types
Grammar format
sort [选项] [参数]
cat [对象] | sort [选项]
Common options
| Common options | Explanation |
|---|---|
| -f | When sorting, treat lowercase letters as uppercase letters (that is, ignore case), and by default uppercase letters are sorted first |
| -n | Sort by numerical value |
| -r | Output the sorted results in reverse order |
| -u | Combine rows with the same content, which means that only one row of the same data is displayed, which is equivalent to uniq |
| -t | Specify the field separator, use [Tab] to separate by default |
| -k | Specify sort field |
| -o <output file> | Output the sorted results to the specified file |
Example
- -n、-r
- -f
- -u
- -t、-k
- -O
uniq command
Overview
- The uniq command is used to report or ignore consecutive repeated lines in a file
- Often used in conjunction with the sort command
Grammar format
uniq [选项] 参数
cat [对象] | uniq 选项
Common options
| Common options | Explanation |
|---|---|
| -c | Count and delete repeated lines in the file |
| -d | Show only consecutive repeated rows |
| -u | Show only lines that occur once |
Example
- -c
- -d、-u
- Used in conjunction with the sort command
- You can count the objects with the most repetitions, which can be applied to detect hacker attacks
tr command
Overview
- The tr(translate) command can be used to replace, compress and delete characters from standard input
Grammar format
tr [选项] [字符集1 字符集2]
##没有选项，则默认将标准输入中所有属于字符集1 的字符替换为字符集2中的字符
Common options
| Common options | Explanation |
|---|---|
| -c | Characters in character set 1 are reserved, and other characters (including newline \n) are replaced with character set 2 |
| -d | Delete all characters belonging to character set 1 |
| -s | Compress repetitive strings into one string; replace character set 1 with character set 2 |
| -t | Character set 2 replaces character set 1, the same result without options |
parameter
- Character set 1:
- Specify the original character set to be converted or deleted
- When performing the conversion operation, you must use the parameter "Character Set 2" to specify the target character set for conversion
- But when executing the delete operation, the parameter "Character Set 2" is not required:
- Character set 2:
- Specify the target character set to be converted
Example
- Case conversion
- -c
- -d
- -s
- Delete empty lines
or
- Replace the ":" in the path variable with a newline character "\n"
or
- Files transferred from Windows to Linux may have incompatibility issues, and "^M" characters will appear
cat [对象] | tr -s "\r" "\n" > [新文件对象]
or
cat [对象] | tr -d "\r" > [新文件对象]
Linux中遇到换行符("\n")会进行回车+换行的操作，回车符反而只会作为控制字符("^M")显示，不发生回车的操作
而windows中要回车符+换行符("\r\n")才会回车+换行，缺少一个控制符或者顺序不对都不能正确的另起一行
First, create a txt file on the host machine, with any content,
save the file and drag it into xshell and view it
- Array sort
你看的没错！tr可以用来数组排序！！
