9.Linux command line Text Processing tool

9.Linux Command line Text Processing tool

• Search text grep based on keyword

· grep ' Test ' /etc/passwd keyword search,

· Find/-user Test | grep Video Search in the results, Find the output is text, and then grep keyword,

• Options: - I. , ignoring case,

-N, displays the number of rows where the result is,

-V, which displays the row that excludes the keyword,

-ax, display the keyword and the following x line,a=after,

-BX, display keywords and front x rows,b=before,

--color=auto keywords are displayed in color,

• Column-based processing of text content cut

· cut-d:-f3/etc/passwd- put passwd A colon is a delimiter that cuts a row into columns, showing the third column of each row,

· grep test/etc/passwd | cut-d:-f3 Look in the results,

· cut-c2-6/etc/passwd find each line of 2-6 the characters,

• Options: - D , specifying delimited characters ( tab is the default ) ,

-F, specify the column number of the output,

-C, delimited based on characters,

• Statistical text information WC (word count)

· WC [ option ]passwd

• Options: - L , counting only the number of rows,

-W, only the words are counted,

-C, counting only bytes,

-M, counting only the number of characters,

· sorting text content sort ,

· sort passwd display after sorting, do not change the original file order

• Options: - R , in reverse order,

-N, sorting based on numbers

-F, ignoring case

-U, delete duplicate rows

-t C, sorting columns byusing C as a delimiter

-K x, when sorting based on the specified character as a column, specifies the sort based on that column,

Uniq is used to delete adjacent duplicate rows

· compare the differences between two files diff, diff test Test1

• Options: - I. , ignoring uppercase and lowercase

-B, ignore the change in the number of spaces

-U, unified display of comparison information, commonly used to generate patch files,diff-u test test1 > Final.patch

• Processing of text content tr, Translate

· tr-d ' TMD ' < Test Delete keywords in file

· TR ' A- z "' A- z ' < The casing in the test conversion file

• Search for and replace text sed,

• Involves regular expressions, slightly

9.Linux command line Text Processing tool