Merge branch 'release/v0.23.0'v0.23.0

* release/v0.23.0:
  Bump version number to 0.23.0
  Remove unused `self` var from clog(1df)
  Change double-quote printf pattern to single-quote
  Move ShellCheck line to correct place in sra(1df)
  Quote EDITOR/VISUAL assignments for clarity
  Explicitly ignore uninteresting tree(1) opts
  Refactor clog(1df), allow args and non-term stdin
  Reimplement bl(1df) in Awk
  Separate ax(1df) manpage args from command
  Make newline explicit for ax(1df)
  Make first ax(1df) arg safer, warn on second arg
  Correct monospaced blocks in Vim plugin docs

1 files changed, 9 insertions, 3 deletions

diff --git a/man/man1/ax.1df b/man/man1/ax.1df
index b3218d37..40125167 100644
--- a/man/man1/ax.1df
+++ b/man/man1/ax.1df
@@ -1,15 +1,21 @@
-.TH AX 1df "July 2016" "Manual page for ax"
+.TH AX 1df "January 2018" "Manual page for ax"
 .SH NAME
 .B ax
 \- evaluate an awk expression
 .SH SYNOPSIS
-.B ax '2.0+3.0'
+.B ax
+\&'2.0+3.0'
 .br
-.B ax %.2f 'sin(2)'
+.B ax
+\&'%.2f\\n' 'sin(2)'
 .SH DESCRIPTION
 .B ax
 evaluates an expression given on the command line with awk(1) and prints its
 result using awk's printf, with an optional format specified preceding the
 expression.
+.SH SECURITY
+Note that the second argument has no evaluation protection on it. There's very
+little to stop a user putting a fully-fledged awk program in as the second
+argument if they needed to. Don't accept untrusted user input in this argument!
 .SH AUTHOR
 Tom Ryder <tom@sanctum.geek.nz>