grep meaning

C: // progra ~ 1 // tugzip // tugzip.exe ???? Representative: C: // program files // tugzip // tugzip.exe Answer:This is a normal phenomenon. It is due to the habit of the DOS operating system. In general, the file name in DOS is 8 characters long and 3 extension characters long.If the number is less than or equal to 8, the full name is displayed. However, if the number of file names is greater than 8 characters, only the first 6 are displayed, followed by a "~" Symbol,The number "1" indicates

Q:Like what:[Email protected] ~]# Ps-ef | grep apachejetspeedRoot 18887 18828 0 08:09 pts/0 00:00:00 grep apachejetspeedis the process running or not running? Which of the list is 18887 and 18828 which is the meaning of pid,0, which can explain the specific meanings of each output item in detail.A:PS: Show a process-a displays all programs.-E The effect o

following example 14 .) 2.2 Exit Status (Exit Status code) Normally, if the content matches, the exit status code is 0; otherwise, it is 1. However, if an error occurs, the exit status code is 2 unless the "-s" or "-q" option is used. 2.3 'grep' Programs (various grep Programs) There are four grep programs that support different search engines. You can use the f

number of rows: CODE: [Sam@chenwy sam]$ grep-c ' ^$ ' myfile uses-n parameters to show the actual line: CODE: [Sam@chenwy sam]$ grep-c ' ^$ ' myfile10. Matching special characters Query for characters that have special meaning, such as $. ' " * [] ^ | \ + ? , you must add \ before a specific character. Suppose you want the query to contain the "." , and the scri

search keyword.19: goooooogle yes!Search for the start and end of g, with at least one o string in the middle, that is, gog, goog... gooog...Woody @ xiaoc :~ /Tmp $ grep-n 'Goo * G' regular_express.txt18: google is the best tools for search keyword.19: goooooogle yes!Search for the rows in which the string starting and ending with g is located.Woody @ xiaoc :~ /Tmp $ grep-n 'G. * G' regular_express.txt //.

^ $. ^ Represents the beginning of the line, $ means the end of the line (not the character, is the position) then ' ^$ ' represents a blank line, because onlyThe beginning and end of the line. Here ^ differs from the ^ meaning used inside []. It indicates that the following string is the beginning of the row.For example, search for the line at the beginning[Email protected]:~/tmp$ grep-n ' ^the ' regular_

: Count the number of matching rows (less used)Here are a few small experiments on the use and options of grep to do a concrete demonstrationExperimental catalogue/test Text/test/head[email protected] test]# cat head 12345 sdabc Saber Berar bserac12cds67890123451236650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/85/85/wKioL1enLOHQBBq6AAA8VZfgRn8682.gif "title=" Grep4.gif "alt=" Wkiol1enlohqbbq6aaa8vzfgrn8682.gif "/>Regular expression: Regua

in the middle, that is, gog, goog... gooog...Woody @ xiaoc :~ /Tmp $ grep-n'Goo * G' regular_express.txt18: google is the best tools for search keyword.19: goooooogle yes! Search for the rows in which the string starting and ending with g is located.Woody @ xiaoc :~ /Tmp $ grep-n 'G. * G' regular_express.txt //. * Indicates 0 or multiple arbitrary characters.1: "Open Source" is a goodMechanisms to develop

keyword.19: goooooogle yes! Search for the start and end of G, with at least one o string in the middle, that is, Gog, Goog... gooog...Woody @ xiaoc :~ /Tmp $ grep-N 'Goo * G' regular_express.txt18: Google is the best tools for search keyword.19: goooooogle yes! Search for the rows in which the string starting and ending with G is located.Woody @ xiaoc :~ /Tmp $ grep-N 'G. * G' regular_express.txt //. * In

* G' regular_express.txt18: google is the best tools for search keyword.19: goooooogle yes! Search for the rows in which the string starting and ending with g is located.Woody @ xiaoc :~ /Tmp $ grep-n 'G. * G' regular_express.txt //. * Indicates 0 or multiple arbitrary characters.1: "Open Source" is a good mechanic to develop programs.14: The gd software is a library for drafting programs.18: google is the best tools for search keyword.19: goooooogle

following command to process directory B: Grep "define" fileA> listA Grep "define" fileA> listB Because the content after define is different, our goal is to find a format similar to define ("TEST_A", "testa"); while the file does not have TEST_A, of course, there are many different define statements. If the diff command is used for comparison, it is difficult to cope with this problem. Therefore, you can

-C #: context: displays the front and back of the row where the matching condition is located # Rows -N: displays the matched row number (less used) -C: count the number of matched rows (use less) The following describes the usage and options of grep in a few small experiments. Experiment directory/test text/test/head 123456789 [root@localhosttest]#cathead 12345Sdabcsaber Berarbserac 12cds 67890 12 345 123 6 Regular Expression:

Grep and grep commands Grep (global search regular expression (RE) and print out the line, full search for regular expressions and print out rows) is a powerful text search tool, it can use regular expressions to search for text and print matching rows. Unix grep families include