Shell Special character _cut Command sort_wc_uniq command tee_tr_split command

Shell Special character Cut command

• Any of any characters
  ? Any one character
  #注释字符
  \ de-Semantic characters
  
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  | pipe character
  Cut intercept string
  -D Specify delimiter
  -f Specifies the Intercept paragraph
  By looking at what we can see,/etc/passwd is divided into 7 segments.
  
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  If you use ":" to intercept the first paragraph of the delimiter
  
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  Intercept the first to second paragraph (comma in English)
  
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  Intercept one to three segments (with a horizontal bar)
  
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  -c Specifies the number of characters (use-C does not use-d-f)
  
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  sort_wc_uniq Command

  Sort sorts
  Sort it alphabetically by using sort
  
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  When a file has numbers, letters, and special symbols the sort default is a special symbol, a number, a letter, and if the first character is the same then the second character is compared.
  • We copy the/etc/passwd to a TXT document Lee, and then add a number to the beginning of the special symbol, the beginning of the content
  
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  Save after exiting we're sort of 1.txt
  
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  As you can see, the sort is a special symbol on the top, the following is the number sort, and the following is the letter
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  -N is numerically sorted (the first character other than the number in the-n case is considered to be 0, which is the front)
  
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  -R Reverse Order
  
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  -T delimiter
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  Wc-l count rows
  
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  Wc-m statistic character count (line break $)
  
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  WC-W statistical terms (delimited by spaces)
  
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  Uniq (only the same two lines together to go heavy, so it is generally used with the sort)
  
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  -C Statistic Repetition number
  
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  Tee_tr_split command

  Tee is similar to redirecting ">", but it shows the content of the redirect, which is the equivalent of a visualization, and the need to add a pipe character when using
  
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  -A Append
  
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  TR Replacement Character
  
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  You can specify a single character substitution, or you can specify a range substitution
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  Split cutting (cutting large files into multiple small files)
  -b Specifies how big it is for a cut (no unit is specified by default unit is byte)
  -l Specifies how many lines of content are a cut
  
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  The cut-off file name defaults to the beginning of X, and of course we can specify the prefix
  
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  Shell Special Symbols

  The prefix of the $ variable, the!$ combination, and the regular inside represents the end of the line.
  Multiple commands are written to one line, separated by semicolons.
  
  `
  ~ User home Directory, which represents a match in a regular expression.
  & put the command behind the command and put it in the background.

  Override redirect,>> redirect,2> error redirect,2>> error append redirect,&> correct and error output redirect.
  [] One of the specified characters, [0-9] [a-za-z] [ABC]
  ll or the meaning (if the first command execution is unsuccessful, the second is executed, if the first one succeeds no longer executes the second article)
  
  `
  && if the previous command executes successfully, the following command will be executed with && (if the previous command does not succeed, the subsequent command will not be executed)
  

Shell Special character _cut Command sort_wc_uniq command tee_tr_split command