[Trisquel-users] Re : The join command is missing the IPv4 addresses in long mixed lists of strings

lcerf at dcc.ufmg.br lcerf at dcc.ufmg.br
Fri Jul 5 20:20:56 CEST 2019

About the end of your post:

You cannot both read and write in a same file; your "two-step solution" is  
I did not know it was OK to redirect twice the standard input; to avoid  
touching the disk I would have created named pipes, as in this short  
(untested) script:
mkfifo file1.sorted file2.sorted
sort -k 1b,1 -o file1.sorted file1 &
sort -k 1b,1 -o file2.sorted file2 &
join file1.sorted file2.sorted > Joined-file0102.txt

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