Awk & sed scripting language

SedOperator example

SedOperator example

Representation	Effect
8d	Delete the input 8th rows.
/^ $/D	Delete all empty rows.
1,/^ $/d	The number of empty rows from the beginning of the input is deleted to 1st (the first empty row is also deleted ).
/Jones/P	Print only the rows that contain "Jones" (use the-n option ).
S/Windows/Linux/	In each input line, replace the first "Windows" instance with "Linux ".
S/bsod/stability/g	In each input line, replace all "bsod" with "stability ".
S/* $ //	Delete all spaces at the end of each line.
S/00 */0/G	Compress all consecutive 0 values to a single 0.
/GUI/d	Delete all rows containing "Gui.
S/GUI // G	Delete all "guis" and maintain the integrity of the remaining parts.

 

 

1. Delete all empty lines in the file
#! /Bin/bash
Sed-E/^ $/D "$1" file.txt
= Sed-e '/^ $/d' file.txt
Exit 0

-E: indicates that the "edit" command is followed (optional) Edit
^: Indicates the beginning of a row.
$: Indicates the end of a row.
D: delete command
"$1": Refers to a command line parameter, indicating that white space or special characters can be used in the file name.

2. replace a string (or matching mode) in a file with another string (or matching mode)
Sed-e "s/$ old_pattern/$ new_pattern/g" $ file_name
S: substitution replacement
"G", that is, the global flag, used to automatically replace

3. Write log files
Echo "'date' + 'whoam' + $ operation" $ @ ""> $ file_name
$ Operation: before the operation is executed, it is recorded in the log file.

4. A two‑dimensional table that prints ASCII codes
#! /Bin/bash
# Pr-ascii.sh: a two-dimensional table that prints ASCII codes.

Start = 33 # printable ASCII character range (decimal ).
End = 125

Echo "decimal hex character" # header.
Echo "-------------------"

For (I = start; I <= end; I ++ ))
Do
Echo $ I | awk '{printf ("% 3d % 2x % C/N", $1, $1, $1 )}'
# In this context, the built-in printf command of Bash is not run:
# Printf "% C" "$ I"
Done

Exit 0

 

 

 

 

1. # delete all original empty rows and add an empty row after each row.
# In this way, each row in the output text is followed by an empty row.
Sed '/^ $/d; G'
2. # delete all even rows
Sed 'n'; D'
3. # insert an empty row before and after the row matching the style "RegEx"
Sed '/RegEx/{X; P; X; G ;}'
4. # insert an empty row before and after the row matching the style "RegEx"
Sed '/RegEx/{X; P; X; G ;}'
# Number each row in the file (simple left alignment ). The "tab" is used here"
# (Tab, see the '/t' usage description at the end of this article) instead of spaces to align edges.
Sed = filename | sed 'n'; S // N // t /'

# Number of all rows in the file (the row number is left and the right of the text is aligned ).
Sed = filename | sed 'n'; S/^ //; S/*/(./{6,/}/)/N // 1 /'

# Number of all rows in the file, but only the row numbers of non-blank rows are displayed.
Sed '/./= 'filename| sed'/./N; S // N //'

# Calculate the number of rows (simulate "WC-L ")
Sed-n' $ ='

# Replace "foo" with "bar" only when the string "Baz" appears in the row"
Sed '/Baz/S/Foo/BAR/G'
# Replace "foo" with "bar", and replace it only when "Baz" is not displayed in the row.
Sed '/Baz /! S/Foo/BAR/G'

 

Others
1、abc-> ABC for all content in myfile.txt
Sed-E's/ABC/G' myfile.txt:
Sed-E's:/ABC: G' myfile.txt

2. perform this operation within the specified number of rows:
Sed-e '1, 10 s/ABC/G' myfile.txt
Only in the first to tenth rows (including the two rows)

3. <B> This </B> is what <B> I </B> meant.
Sed-E's/<. *> // G' myfile.html-> meant.
Sed-E's/<[^>] *> // G' myfile.html-> This is what I meant.
'[^>]' Specifies the "not"> '"character, and the' * 'after it completes this expression to indicate" zero or multiple ">" characters ".

4. [A-Z] [A-Z]

5. Assume that you are replying to a message. The following example adds the phrase "Ralph said:" in front of each line :":
Sed-E's/. */Ralph said: &/'origmsg.txt

The output is as follows:
Ralph said: Hiya Jim, Ralph said:
I sure like this sed stuff! Ralph said:

6. Delete content starting #
Sed-E/^ #/d myfile.txt

Main () function in the output file
Sed-n-e '/main [[: Space:] * (/,/^}/P' file.txt
Sed-n-e '/main [-v] * (/,/^}/P' file.txt

Reverse row
Sed-e'1! G; h; $! D' forward.txt> backward.txt
Explanation:
The 'G' command applies only the first line. However, there is another '! 'Character -- this '! The 'character ignores this address, that is, the 'G' command applies to all rows except the first line.
If the command is '$ d', only the 'D' command will be applied to the last line in the file (' $ 'address is a simple way to specify the last line ). However, '! ',' $! D' applies the 'D' command to all rows except the last row.

7. DOS/Windows-based text files have a Cr (Press ENTER) and LF (line feed) at the end of each line, while UNIX text has only one line feed.

Migrate UNIX text to Windows
Sed-E's/$ // R/'myunix.txt> mydos.txt

Convert DOS/Windows text to trusted UNIX format
Sed-E's/. $ // 'mydos.txt> myunix.txt

10. script language:
Change. SH: sed-E's //(. */)/(. */)/(. */)/Victor/1-/2 von/3/'myfile.txt
Myfile.txt: Foo bar oni eeny meeny miny Larry curly Moe Jimmy the Weasel
Run:./change. Sh
Output: Victor Foo bar oni eeny meeny miny Larry curly Moe Jimmy the weasel-von

 

Reference:

Http://www.tsnc.edu.cn/default/tsnc_wgrj/doc/abs-3.9.1_cn/html/wrapper.html#EX3

Http://sed.sourceforge.net/sed1line_zh-CN.html

Http://www.ibm.com/developerworks/cn/linux/shell/sed/sed-1/