diff --git a/.lessfilter b/.lessfilter
index dbc8ed6..4de833b 100755
--- a/.lessfilter
+++ b/.lessfilter
@@ -1,5 +1,5 @@
 #!/bin/bash
-# uses Pygments v2.18.0 for syntax highlighting on applicable file types
+# uses Pygments v2.19.2 for syntax highlighting on applicable file types
 for path in "$@"; do
     # match by known filenames
     filename=$(basename "$path")
@@ -36,56 +36,57 @@ for path in "$@"; do
         *.exw|*.ezt|*.f|*.f03|*.f90|*.factor|*.fan|*.fancypack|*.fc|*.feature|\
         *.fhtml|*.fif|*.fish|*.flo|*.flx|*.flxh|*.fnl|*.frag|*.frt|*.fs|*.fsi|\
         *.fst|*.fsti|*.fsx|*.fun|*.func|*.fut|*.fy|*.g|*.gap|*.gcode|*.gd|\
-        *.gdc|*.gemspec|*.geo|*.gi|*.go|*.golo|*.gradle|*.graph|*.graphql|\
-        *.groovy|*.gs|*.gsp|*.gsql|*.gst|*.gsx|*.gv|*.h|*.h++|*.haml|\
-        *.handlebars|*.hbs|*.hcl|*.hdp|*.hh|*.hlsl|*.hlsli|*.hpp|*.hrl|*.hs|\
-        *.hsail|*.htm|*.htm.j2|*.htm.jinja2|*.html|*.html.j2|*.html.jinja2|\
-        *.htmlul4|*.hx|*.hxml|*.hxsl|*.hxx|*.hy|*.hyb|*.i|*.i6t|*.i7x|*.icl|\
-        *.icn|*.icon|*.idc|*.idl|*.idl4|*.idr|*.ijs|*.ik|*.inc|*.inf|*.ini|\
-        *.ino|*.instances|*.intr|*.io|*.ipf|*.isa|*.j|*.jade|*.jag|*.janet|\
-        *.java|*.jbst|*.jcl|*.jdn|*.jl|*.jp|*.js|*.js.in|*.js.j2|*.js.jinja2|\
-        *.jsgf|*.jslt|*.jsm|*.json|*.jsonl|*.jsonld|*.jsonnet|*.jsp|*.jsul4|\
-        *.jsx|*.juttle|*.jy|*.k|*.kal|*.kid|*.kif|*.kk|*.kki|*.kmsg|*.kn|\
-        *.kql|*.ksh|*.kt|*.kts|*.kusto|*.lagda|*.lasso|*.lasso[89]|*.lcry|\
-        *.ldif|*.lean|*.leex|*.less|*.lgt|*.lhs|*.libsonnet|*.lid|*.lidr|\
-        *.liquid|*.lisp|*.ll|*.load|*.logtalk|*.lpad|*.ls|*.lsl|*.lsp|*.lua|\
-        *.luau|*.ly|*.m|*.m2|*.ma|*.mac|*.mak|*.man|*.mao|*.maql|*.markdown|\
-        *.mask|*.max|*.mc|*.mcfunction|*.mcschema|*.md|*.mhtml|*.mi|*.mips|\
-        *.mir|*.mjs|*.mk|*.ml|*.mli|*.mll|*.mly|*.mm|*.mo|*.mod|*.mojo|\
-        *.monkey|*.moo|*.moon|*.mos|*.mount|*.mq4|*.mq5|*.mqh|*.ms|*.msc|*.mt|\
+        *.gdc|*.gemspec|*.geo|*.gi|*.gleam|*.go|*.golo|*.googlesql|\
+        *.googlesql.sql|*.gradle|*.graph|*.graphql|*.groovy|*.gs|*.gsp|*.gsql|\
+        *.gst|*.gsx|*.gv|*.h|*.h++|*.ha|*.haml|*.handlebars|*.hbs|*.hcl|*.hdp|\
+        *.hh|*.hlsl|*.hlsli|*.hpp|*.hrl|*.hs|*.hsail|*.htm|*.htm.j2|\
+        *.htm.jinja2|*.html|*.html.j2|*.html.jinja2|*.htmlul4|*.hx|*.hxml|\
+        *.hxsl|*.hxx|*.hy|*.hyb|*.i|*.i6t|*.i7x|*.icl|*.icn|*.icon|*.idc|\
+        *.idl|*.idl4|*.idr|*.ijs|*.ik|*.inc|*.inf|*.ini|*.ino|*.instances|\
+        *.intr|*.io|*.ipf|*.isa|*.j|*.jade|*.jag|*.janet|*.java|*.jbst|*.jcl|\
+        *.jdn|*.jl|*.jp|*.js|*.js.in|*.js.j2|*.js.jinja2|*.jsgf|*.jslt|*.jsm|\
+        *.json|*.json5|*.jsonl|*.jsonld|*.jsonnet|*.jsp|*.jsul4|*.jsx|\
+        *.juttle|*.jy|*.k|*.kal|*.kid|*.kif|*.kk|*.kki|*.kmsg|*.kn|*.kql|\
+        *.ksh|*.kt|*.kts|*.kusto|*.lagda|*.lasso|*.lasso[89]|*.lcry|*.ldif|\
+        *.lean|*.leex|*.less|*.lgt|*.lhs|*.libsonnet|*.lid|*.lidr|*.liquid|\
+        *.lisp|*.ll|*.load|*.logtalk|*.lpad|*.ls|*.lsl|*.lsp|*.lua|*.luau|\
+        *.ly|*.m|*.m2|*.ma|*.mac|*.mak|*.man|*.mao|*.maql|*.markdown|*.mask|\
+        *.max|*.mc|*.mcfunction|*.mcschema|*.md|*.mhtml|*.mi|*.mips|*.mir|\
+        *.mjs|*.mk|*.ml|*.mli|*.mll|*.mly|*.mm|*.mo|*.mod|*.mojo|*.monkey|\
+        *.moo|*.moon|*.mos|*.mount|*.mpl|*.mq4|*.mq5|*.mqh|*.ms|*.msc|*.mt|\
         *.mu|*.mxml|*.myt|*.n|*.nasm|*.nb|*.nbp|*.nc|*.ncl|*.ndjson|*.ng2|\
         *.ni|*.nim|*.nimrod|*.nit|*.nix|*.nl|*.nqp|*.ns2|*.nsh|*.nsi|*.nt|\
-        *.objdump|*.objdump-intel|*.odin|*.ooc|*.opa|*.orc|*.org|*.p|*.p6|\
-        *.p6l|*.p6m|*.pack|*.pan|*.pas|*.patch|*.path|*.pc|*.pcmk|*.peg|*.pem|\
-        *.perl|*.ph|*.php|*.php[345]|*.phtml|*.pidl|*.pig|*.pike|*.pl|*.pl6|\
-        *.plot|*.plt|*.pm|*.pm6|*.pml|*.pmod|*.po|*.pony|*.portugol|*.pot|\
-        *.pov|*.pp|*.pr|*.praat|*.prg|*.prm|*.pro|*.proc|*.prolog|*.prom|\
-        *.promela|*.promql|*.properties|*.proto|*.prql|*.ps|*.ps1|*.psc|*.psi|\
-        *.psl|*.psm1|*.ptls|*.ptx|*.pug|*.pwn|*.pxd|*.pxi|*.py|*.py2tb|\
-        *.py3tb|*.pyi|*.pypylog|*.pytb|*.pyul4|*.pyw|*.pyx|*.q|*.qbs|*.qml|\
-        *.qvs|*.qvto|*.qvw|*.r|*.r3|*.rake|*.raku|*.rakudoc|*.rakumod|\
-        *.rakutest|*.rb|*.rbw|*.rbx|*.re|*.react|*.reb|*.red|*.reds|*.reg|\
-        *.rei|*.resource|*.rest|*.rex|*.rexx|*.rhtml|*.ride|*.rita|*.rkt|\
-        *.rktd|*.rktl|*.rl|*.rnc|*.robot|*.rpf|*.rq|*.rql|*.rs|*.rs.in|*.rsl|\
-        *.rss|*.rst|*.rts|*.run|*.rvt|*.rx|*.s|*.sage|*.sarl|*.sas|*.sass|\
-        *.savi|*.sbl|*.sc|*.scad|*.scala|*.scaml|*.scd|*.scdoc|*.sce|*.sci|\
-        *.scm|*.sco|*.scope|*.scss|*.sed|*.service|*.sgf|*.sh|*.sh-session|\
-        *.shell-session|*.shen|*.shex|*.sieve|*.sig|*.sil|*.siv|*.sl|*.sla|\
-        *.slice|*.slim|*.sls|*.smali|*.smithy|*.sml|*.smv|*.snbt|*.snobol|\
-        *.socket|*.sol|*.sp|*.sparql|*.spec|*.spice|*.spt|*.sql|*.sql.j2|\
-        *.sql.jinja2|*.sqlite3-console|*.ss|*.ssp|*.st|*.stan|*.sv|*.svh|\
-        *.swap|*.swg|*.swift|*.t|*.tac|*.tact|*.tal|*.tap|*.target|*.tasm|\
-        *.tcl|*.tcsh|*.tea|*.teal|*.tex|*.tf|*.thrift|*.thy|*.ti|*.tid|\
-        *.timer|*.tlb|*.tmpl|*.tnt|*.toc|*.todotxt|*.toml|*.tpl|*.tpp|\
-        *.treetop|*.ts|*.tst|*.tt|*.ttl|*.twig|*.txt|*.typ|*.typoscript|*.u|\
-        *.u1|*.u2|*.udo|*.ul4|*.usd|*.usda|*.v|*.vala|*.vapi|*.vark|*.vb|\
-        *.vbs|*.vcl|*.vert|*.vhd|*.vhdl|*.vim|*.vipgrm|*.vm|*.vp|*.vpr|*.vy|\
-        *.wast|*.wat|*.wdiff|*.webidl|*.weechatlog|*.wgsl|*.whiley|*.wlua|\
-        *.wren|*.wsdl|*.wsf|*.x|*.x10|*.x[bp]m|*.xhtml|*.xhtml.j2|\
-        *.xhtml.jinja2|*.xi|*.xm|*.xmi|*.xml|*.xml.j2|*.xml.jinja2|*.xmlul4|\
-        *.xpl|*.xpp|*.xq|*.xql|*.xqm|*.xquery|*.xqy|*.xsd|*.xsl|*.xslt|\
-        *.xtend|*.xtm|*.xul.in|*.yaml|*.yaml.j2|*.yaml.jinja2|*.yang|*.yar|\
-        *.yml|*.yml.j2|*.yml.jinja2|*.zeek|*.zep|*.zig|*.zone|*.zsh|*.🔥|\
+        *.numbair|*.objdump|*.objdump-intel|*.odin|*.ooc|*.opa|*.orc|*.org|\
+        *.p|*.p6|*.p6l|*.p6m|*.pack|*.pan|*.pas|*.patch|*.path|*.pc|*.pcmk|\
+        *.pddl|*.peg|*.pem|*.perl|*.ph|*.php|*.php[345]|*.phtml|*.pidl|*.pig|\
+        *.pike|*.pl|*.pl6|*.plot|*.plt|*.pm|*.pm6|*.pml|*.pmod|*.po|*.pony|\
+        *.portugol|*.pot|*.pov|*.pp|*.pr|*.praat|*.prg|*.prm|*.pro|*.proc|\
+        *.prolog|*.prom|*.promela|*.promql|*.properties|*.proto|*.prql|*.ps|\
+        *.ps1|*.psc|*.psi|*.psl|*.psm1|*.ptls|*.ptx|*.pug|*.pwn|*.pxd|*.pxi|\
+        *.py|*.py2tb|*.py3tb|*.pyi|*.pypylog|*.pytb|*.pyul4|*.pyw|*.pyx|*.q|\
+        *.qbs|*.ql|*.qll|*.qml|*.qvs|*.qvto|*.qvw|*.r|*.r3|*.rake|*.raku|\
+        *.rakudoc|*.rakumod|*.rakutest|*.rb|*.rbw|*.rbx|*.re|*.react|*.reb|\
+        *.red|*.reds|*.reg|*.rego|*.rei|*.resource|*.rest|*.rex|*.rexx|\
+        *.rhtml|*.ride|*.rita|*.rkt|*.rktd|*.rktl|*.rl|*.rnc|*.robot|*.rpf|\
+        *.rq|*.rql|*.rs|*.rs.in|*.rsl|*.rss|*.rst|*.rts|*.run|*.rvt|*.rx|*.s|\
+        *.sage|*.sarl|*.sas|*.sass|*.savi|*.sbl|*.sc|*.scad|*.scala|*.scaml|\
+        *.scd|*.scdoc|*.sce|*.sci|*.scm|*.sco|*.scope|*.scss|*.sed|*.service|\
+        *.sgf|*.sh|*.sh-session|*.shell-session|*.shen|*.shex|*.sieve|*.sig|\
+        *.sil|*.siv|*.sl|*.sla|*.slice|*.slim|*.sls|*.smali|*.smithy|*.sml|\
+        *.smv|*.snbt|*.snobol|*.socket|*.sol|*.sources|*.sp|*.sparql|*.spec|\
+        *.spice|*.spt|*.sql|*.sql.j2|*.sql.jinja2|*.sqlite3-console|*.ss|\
+        *.ssp|*.st|*.stan|*.sv|*.svh|*.swap|*.swg|*.swift|*.t|*.tac|*.tact|\
+        *.tal|*.tap|*.target|*.tasm|*.tcl|*.tcsh|*.td|*.tea|*.teal|*.tex|*.tf|\
+        *.thrift|*.thy|*.ti|*.tid|*.timer|*.tlb|*.tmpl|*.tnt|*.toc|*.todotxt|\
+        *.toml|*.tpl|*.tpp|*.treetop|*.ts|*.tst|*.tsx|*.tt|*.ttl|*.twig|*.txt|\
+        *.typ|*.typoscript|*.u|*.u1|*.u2|*.udo|*.ul4|*.usd|*.usda|*.v|*.vala|\
+        *.vapi|*.vark|*.vb|*.vbs|*.vcl|*.vert|*.vhd|*.vhdl|*.vim|*.vipgrm|\
+        *.vm|*.vp|*.vpr|*.vue|*.vy|*.wast|*.wat|*.wdiff|*.webidl|*.weechatlog|\
+        *.wgsl|*.whiley|*.wlua|*.wren|*.wsdl|*.wsf|*.x|*.x10|*.x[bp]m|*.xhtml|\
+        *.xhtml.j2|*.xhtml.jinja2|*.xi|*.xm|*.xmi|*.xml|*.xml.j2|*.xml.jinja2|\
+        *.xmlul4|*.xpl|*.xpp|*.xq|*.xql|*.xqm|*.xquery|*.xqy|*.xsd|*.xsl|\
+        *.xslt|*.xtend|*.xtm|*.xul.in|*.yaml|*.yaml.j2|*.yaml.jinja2|*.yang|\
+        *.yar|*.yml|*.yml.j2|*.yml.jinja2|*.zeek|*.zep|*.zig|*.zone|*.zsh|*.🔥|\
         *Config.in*|*Spec.hs|.Renviron|.Rhistory|.Rprofile|.SRCINFO|.bashrc|\
         .csl|.editorconfig|.exrc|.gvimrc|.htaccess|.kshrc|.ldaprc|.vimrc|\
         .zshrc|Android.bp|BUCK|BUILD|BUILD.bazel|CMakeLists.txt|Dockerfile|\
@@ -103,6 +104,14 @@ for path in "$@"; do
             ;;
         *)
             # attempt to parse the lexer from the shebang if it exists
+            # ensure that grep and awk are installed
+            for prog in grep awk; do
+                if ! command -v "$prog" &>/dev/null; then
+                    echo "\`$prog\` not found; unable to parse shebang" >&2
+                    # fall-back to plain text
+                    exit 1
+                fi
+            done
             lexer=$(head -n 1 "$path" | grep '^#\!' | awk -F" " \
 '{ if (/env/) { print $2 } else { sub( /.*\//, ""); print $1;} }')
             case "$lexer" in
@@ -124,4 +133,4 @@ for path in "$@"; do
             ;;
     esac
 done
-exit 0
\ No newline at end of file
+exit 0
diff --git a/README.md b/README.md
index a96fea5..334fb03 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ export LESSOPEN='|~/.lessfilter %s'
 ```
 
 ### 4. Generate `.lessfilter` (optional)
-This repo contains a pre-generated [.lessfilter](.lessfilter) which is currently at version `2.18.0` and is updated occasionally.  You could use that and skip to the next step, even if its version lags behind that of Pygments (any unsupported file types would fallback to plain-text).
+This repo contains a pre-generated [.lessfilter](.lessfilter) which is currently at version `2.19.2` and is updated occasionally.  You could use that and skip to the next step, even if its version lags behind that of Pygments (any unsupported file types would fallback to plain-text).
 
 You could also generate a `.lessfilter` yourself by running [main.py](main.py), which scrapes the Pygments lexer documentation website and produces a `.lessfilter` in this directory which corresponds to the latest published version:
 ```shell
diff --git a/templates/template.lessfilter.sh b/templates/template.lessfilter.sh
index 30d5287..465270b 100644
--- a/templates/template.lessfilter.sh
+++ b/templates/template.lessfilter.sh
@@ -14,6 +14,14 @@ for path in "$@"; do
             ;;
         *)
             # attempt to parse the lexer from the shebang if it exists
+            # ensure that grep and awk are installed
+            for prog in grep awk; do
+                if ! command -v "$prog" &>/dev/null; then
+                    echo "\`$prog\` not found; unable to parse shebang" >&2
+                    # fall-back to plain text
+                    exit 1
+                fi
+            done
             lexer=$(head -n 1 "$path" | grep '^#\!' | awk -F" " \
 '{ if (/env/) { print $2 } else { sub( /.*\//, ""); print $1;} }')
             case "$lexer" in