diff --git a/sh/sortip b/sh/sortip
index c1130ca..56e60bd 100755
--- a/sh/sortip
+++ b/sh/sortip
@@ -1,8 +1,8 @@
 #!/usr/bin/sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 sortip() { ### @- sort lines numerically by IPv4 segments.
-    sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n "$@"
+    LC_ALL=C sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n "$@"
 }
 
 [ -n "${preload+-}" ] || sortip "$@"
diff --git a/sh/subdue b/sh/subdue
index 94031ac..2a5328d 100755
--- a/sh/subdue
+++ b/sh/subdue
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush -ksh +mksh -oksh +osh +posh +yash +zsh
 
 __subdue() { ### @subdue
     ### reconfigure your terminal's color scheme using a preset for [recolor.](#recolor)
diff --git a/sh/sum b/sh/sum
index 522ecd2..a6b6a5d 100755
--- a/sh/sum
+++ b/sh/sum
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 sum() { ### @-
     ### compute the summation of its arguments without forking processes.
diff --git a/sh/sv b/sh/sv
index 44ef5c9..ba44d4a 100755
--- a/sh/sv
+++ b/sh/sv
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh YES_BB_AWK
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh YES_BB_AWK
 
 sv() { ### @-
     ### collect the lastmost value of every key.
diff --git a/sh/trash b/sh/trash
index ae73451..76ec0a4 100755
--- a/sh/trash
+++ b/sh/trash
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 trash() { ### @-
     ### output a given number of bytes from `/dev/random`.
diff --git a/sh/trunc b/sh/trunc
index 8105bc1..9c59115 100755
--- a/sh/trunc
+++ b/sh/trunc
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh YES_BB_AWK
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh YES_BB_AWK
 
 trunc() { ### @-
     ### truncate text to fit within your terminal using the unicode character `…`.
@@ -12,8 +12,8 @@ trunc() { ### @-
     ### ```
 
     [ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
-    COLUMNS=${COLUMNS:-$(tput cols)}
-    awk -vL=${1:-$COLUMNS} '{e=length()>L?"…":"";print substr($0,0,L-(e?1:0)) e}'
+    COLUMNS="${COLUMNS:-"$(tput cols)"}"
+    awk -vL="${1:-$COLUMNS}" '{e=length()>L?"…":"";print substr($0,0,L-(e?1:0)) e}'
 }
 
 [ -n "${preload+-}" ] || trunc "$@"
diff --git a/sh/unarchive b/sh/unarchive
index f58d5a0..2c62d57 100755
--- a/sh/unarchive
+++ b/sh/unarchive
@@ -1,5 +1,5 @@
 #!/usr/bin/env zsh
-# compat: -ash -bash -dash +zsh
+# compat: -ash -bash -dash -hush -ksh -mksh -oksh -osh -posh -yash +zsh
 
 unarchive() { ### @- extract the contents of an archive file in one of many formats.
     ### borrowed from [prezto.](https://github.com/sorin-ionescu/prezto)
diff --git a/sh/unwrap b/sh/unwrap
index a9ab553..c171a91 100755
--- a/sh/unwrap
+++ b/sh/unwrap
@@ -1,8 +1,8 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 unwrap() { ### @- join paragraphs into one line each.
-    awk '\''BEGIN{RS="\n\n";FS="\n"}{for(i=1;i<=NF;i++)printf "%s ",$i;print "\n"}'\'
+    awk 'BEGIN{RS="\n\n";FS="\n"}{for(i=1;i<=NF;i++)printf "%s ",$i;print "\n"}'
 }
 
 [ -n "${preload+-}" ] || unwrap "$@"
diff --git a/sh/v_domap b/sh/v_domap
index 227948a..e7e6879 100644
--- a/sh/v_domap
+++ b/sh/v_domap
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush -ksh +mksh -oksh +osh +posh +yash +zsh
 
 v_domap() {
     argc $# -eq 1 "$0" || return
diff --git a/sh/v_lower b/sh/v_lower
index 0479f99..c2b2e2e 100644
--- a/sh/v_lower
+++ b/sh/v_lower
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush -ksh +mksh -oksh +osh +posh +yash +zsh
 
 v_lower() { ### @- transform the contents of a variable to lowercase.
     argc $# -eq 1 "$0" || return
diff --git a/sh/v_upper b/sh/v_upper
index d787215..1641c86 100644
--- a/sh/v_upper
+++ b/sh/v_upper
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush -ksh +mksh -oksh +osh +posh +yash +zsh
 
 v_upper() { ### @- transform the contents of a variable to uppercase.
     argc $# -eq 1 "$0" || return
diff --git a/sh/wat b/sh/wat
index bfae5d3..010820b 100755
--- a/sh/wat
+++ b/sh/wat
@@ -1,5 +1,5 @@
 #!/usr/bin/env zsh
-# compat: -ash -bash -dash +zsh
+# compat: -ash -bash -dash -hush -ksh -mksh -oksh -osh -posh -yash +zsh
 
 # wat - a better and recursive which/whence
 # via: https://leahneukirchen.org/dotfiles/tools.html
diff --git a/sh/xxp b/sh/xxp
index cea9b5b..5b603da 100755
--- a/sh/xxp
+++ b/sh/xxp
@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 xxp() { ### @-
     ### act like `xxd -p`, but nicely formatted.