使用sed更改文件中一行的位置

Question

我想知道如何更改文件中一行的位置(最好使用sed).例如,考虑包含的文件

goal identifier statement  
let statement 1  
let statement 2  
forall statement  
other statements

我希望能够做到这一点

goal identifier statement  
forall statement  
let statement 1  
let statement 2  
other statements  

我改变了forall线的位置并将其带到了球门线后面.forall和goal是可用于识别线条的正则表达式.

Answer 1

你可以尝试,为移动line 4到line 2,我想移动line A到line B,其中A>B

sed -n '2{h; :a; n; 4{p;x;bb}; H; ba}; :b; p' file

要么 A<B

sed -n '2{h; d}; 4{p; x;}; p' file

你得到,在第一种情况下:移动line 4到line 2

goal identifier statement
forall statement
let statement 1
let statement 2
other statements

你得到的,在第二种情况:移动line 2到line 4

goal identifier statement  
let statement 2  
forall statement  
let statement 1  
other statements

说明

sed -n '              #silent option ON
    2{                #if is line 2
        h             #Replace the contents of the hold space with the contents of the pattern space
        :a            #label "a"
        n             #fetch the next line
        4{            #if is line 4
            p         #print line 4
            x         #Exchange the contents of the hold and pattern spaces
            bb        #goto "b"
        }
        H             #appends line from the pattern space to the hold space, with a newline before it.
        ba            #goto "a"
    }
    :b                #Label "b"
    p                 #print
' file 

编辑

如果要使用regex标识行,可以修改第一个命令

sed -n '/goal/{p;n;h;:a;n;/forall/{p;x;bb};H;ba};:b;p' file