[PATCH] docs: column.1 describe change of separator behavior in bugs section

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Add to manual page how to achieve old behavior, just in case someone
relies on buggy behavior of the command.

Reported-by: P�aig Brady <P@xxxxxxxxxxxxxx>
Signed-off-by: Sami Kerola <kerolasa@xxxxxx>
---
 text-utils/column.1 | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/text-utils/column.1 b/text-utils/column.1
index 2050666..775c73b 100644
--- a/text-utils/column.1
+++ b/text-utils/column.1
@@ -65,6 +65,35 @@ the screen if no other information is available.
 .nf
 sed 's/#.*//' /etc/fstab | column -t
 .nf
+.SH BUGS
+The util-linux version 2.23 changed
+.B \-s
+option to be non-greedy.  The change made the following output
+.PP
+.EX
+$ printf "a:b:c\n1::3\n" | column  -t -s ':'
+a  b  c
+1  3
+.EE
+.PP
+to be
+.PP
+.EX
+$ printf "a:b:c\n1::3\n" | column  -t -s ':'
+a  b  c
+1     3
+.EE
+.PP
+If there is need to use greedy separator the old behavior can be achieved
+by filtering with
+.BR sed (1).
+.PP
+.EX
+$ printf "xzcatxzdog\\ndonkeyxzzxkong\\n" |
+> sed 's/^[xz]*//
+> s/[xz]\\+/x/g' |
+> column -t -s xz
+.EE
 .SH "SEE ALSO"
 .BR colrm (1),
 .BR ls (1),
-- 
1.7.12.1

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