cut+paste
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Do you ever wish you could paste two (or even three) files side by side? You can, if you have the System V paste program (or the public-domain implementation on the disc). |
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For example, to create a three-column file from files x , y , and z :
$paste x y z > file
To make
paste
read standard input, use the
-
option, and repeat
-
for every column you want. For example, to make an old broken System V
ls
(which lists files in a single column) list files in four columns:
$ls | paste - - - -
The "standard input" option is also handy when used with cut ( 35.14 ) . You can cut data from one position on a line and paste it back on another.
The separate data streams being merged are separated by default with a tab, but you can change this with the -d option. Unlike the -d option to cut , you need not specify a single character; instead, you can specify a list of characters, which will be used in a circular fashion. (I haven't figured a use for this - maybe you can.)
The characters in the list can be any regular character or the following escape sequences:
\n
newline
\t
tab
\\
backslash
\0
empty string
Use quoting ( 8.14 ) , if necessary, to protect characters from the shell.
There's also a -s option that lets you merge subsequent lines from one file. For example, to merge each pair of lines onto a single line:
$paste -s -d"\t\n" list
-
,