JN(1): join fields
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USAGE
usage: jn [-1Du] [-i isep] [-k1 nb] [-k2 nb] [-o osep] {file}
-1: fields are separated by one run of the separator
string
-D: debug
-i isep: input field separator character(s) or string
under -1
-k1 nb: join on this field nb. for 1st file
-k2 nb: join on this field nb. for 2nd and following
files
-o osep: output field delimiter string
-u: unix IO
DESCRIPTION
Jn joins the lines in input files. Each line is considered as a
record, with field numbers counting from 1. The join combines
records with the same key in all files. If a key is found in one
file, a line is generated for it even if it is not found in any
other file. Files need not to be sorted. By default, the first
field is used as the key. Flags -k1 and -k2 can be used to set a
different key for the first file and for all other files.
By default the field separator is a run of blanks. Flag -F
changes the set of runes used as field separators to its
argument.
Flag -1 indicates that fields are separated exactly by one
instance of the separator string. Such string defaults to a
tabulator character in this case, unless -F says otherwise.
The output is printed sorted on the key field. Output fields are
separated by default using a tab character or the sep string if
-1 is used.
EXAMPLES
Join the lines of ids and all grade files using the first field
in ids and the second in others. Generate output fields separated
by a : character:
; lf -g ids ,~grade | jn -u -k2 2 -o: f1 f2
SOURCE
+o /zx/sys/src/clive/cmd/jn
SEE ALSO
+o flds(1) to select fields in output.
+o lns(1) to select lines in output.
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User's manual. Section 1. Copyright © LSUB 2014-2016