Commandline program to concatenate file lines. Supports a separator string, removing empty lines, removing leading whitespaces, grouping and can be used in pipes.
When one googles how to join lines in e.g. Bash, then you might find solutions like shown here.
One of these solutions is a Posix commandline tool called paste, which already has a misleading name and uses in the
short description also the word "merge", which again is misleading in my opinion. So it was time to create something
that makes more sense.
make
concat [-vhlwne] [-s <sep>] [-g <num>] [-S <sep>] [file]
You can't pass a file when text is piped into concat.
-s <sep> optional separator string
-g <num> add group separator string after <num> of lines
-S <sep> optional group separator string (default is newline)
-e interpret some few escape sequences (\\,\t,\n)
-l remove empty lines
-w remove leading whitespaces
-n do not output the trailing newline
-v print version info
-h print help text
$ cat file
a
b
c
$ concat file
abc
$ echo -e "a\nb\nc" | concat
abc
$ cat file
a
b
c
$ concat -s ',' file
a,b,c
$ cat file | tr '\n' ','
a,b,c,
$ concat -e -s '\t' file
a b c
$ concat -s ' - ' file
a - b - c
Notice how tr would replace also the last newline with a comma, which sometimes is not what you want, e.g. when in CSV
files the last comma would create a new empty column.
$ cat file
a
b
c
$ concat -s ';' file
a;;b;;c
$ concat -s ';' -l file
a;b;c
$ cat file
a
b
c
$ concat -s ':' file
a: b: c
$ concat -s ':' -w file
a:b:c
$ cat file
a
b
c
a
b
c
$ concat file
abcabc
$ concat -g 3 file
abc
abc
$ concat -e -g 3 -S '\n---\n' file
abc
---
abc
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