diff --git a/contrib/adc/able b/contrib/adc/able
index a776a3a..1b73819 100755
--- a/contrib/adc/able
+++ b/contrib/adc/able
@@ -1,17 +1,17 @@
 #!/bin/bash
 
-# WARNING: USES BASH FEATURES...
+# WARNING: USES BASH FEATURES TO AVOID A TEMP FILE; CAN BE FIXED IF NEEDED
 
 . $(dirname $0)/adc.common-functions
 
 get_rights_and_owner gitolite-admin
-[[ -z $perm_write ]] && die "just *what* are you trying to pull, young man?"
+[ -z "$perm_write" ] && die "just *what* are you trying to pull, young man?"
 
 op=$1
 shift
 
 locs=
-while [[ -n $1 ]]
+while [ -n "$1" ]
 do
     case $1 in
         '@all' )
@@ -33,7 +33,7 @@ case $op in
         done
         ;;
     dis|disable )
-        [[ -t 0 ]] && printf message:
+        # bashism
         read msg <<<$(cat)
         for l in $locs
         do
diff --git a/contrib/adc/adc.common-functions b/contrib/adc/adc.common-functions
index 2631ed2..0d2878c 100644
--- a/contrib/adc/adc.common-functions
+++ b/contrib/adc/adc.common-functions
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # please make sure this file is NOT chmod +x
 
@@ -11,7 +11,7 @@ get_rights_and_owner() {
     # set shell variables as needed
     owner=${ans#* }
     rights=${ans% *}
-    [[ $rights =~ C ]]  && perm_create=yes  || perm_create=
-    [[ $rights =~ R ]]  && perm_read=yes    || perm_read=
-    [[ $rights =~ W ]]  && perm_write=yes   || perm_write=
+    echo $rights | grep C >/dev/null 2>&1 && perm_create=yes  || perm_create=
+    echo $rights | grep R >/dev/null 2>&1 && perm_read=yes    || perm_read=
+    echo $rights | grep W >/dev/null 2>&1 && perm_write=yes   || perm_write=
 }
diff --git a/contrib/adc/fork b/contrib/adc/fork
index 758675f..d5b065a 100755
--- a/contrib/adc/fork
+++ b/contrib/adc/fork
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 from=$1
 to=$2
@@ -10,10 +10,10 @@ to=$2
 # have a new "git-init" command!
 
 get_rights_and_owner $from
-[[ -z $perm_read ]] && die "no read permissions on $from"
+[ -z "$perm_read" ] && die "no read permissions on $from"
 
 get_rights_and_owner $to
-[[ -z $perm_create ]] && die "no create permissions on $to"
+[ -z "$perm_create" ] && die "no create permissions on $to"
 
 # let gitolite create the repo first
 SSH_ORIGINAL_COMMAND="git-init '$to'" $GL_BINDIR/gl-auth-command $GL_USER
diff --git a/contrib/adc/restrict-admin b/contrib/adc/restrict-admin
index 97ad0d1..8d3d892 100755
--- a/contrib/adc/restrict-admin
+++ b/contrib/adc/restrict-admin
@@ -1,9 +1,9 @@
-#!/bin/bash
+#!/bin/sh
 
 . $(dirname $0)/adc.common-functions
 
 get_rights_and_owner gitolite-admin
-[[ -z $perm_write ]] && die "just *what* are you trying to pull, young man?"
+[ -z "$perm_write" ] && die "just *what* are you trying to pull, young man?"
 
 # and here you let them do the dangerous stuff
 echo "+rm -rf $GL_REPO_BASE_ABS"
diff --git a/contrib/adc/rmrepo b/contrib/adc/rmrepo
index fa2554f..e1c288c 100755
--- a/contrib/adc/rmrepo
+++ b/contrib/adc/rmrepo
@@ -1,11 +1,11 @@
-#!/bin/bash
+#!/bin/sh
 
 . $(dirname $0)/adc.common-functions
 
 delete=$1
 
 get_rights_and_owner $delete
-[[ $owner == $GL_USER ]] || die "$delete is not yours to delete!"
+[ "$owner" = "$GL_USER" ] || die "$delete is not yours to delete!"
 
 cd $GL_REPO_BASE_ABS
 rm -rf $delete.git
diff --git a/src/gl-emergency-addkey b/src/gl-emergency-addkey
index d488798..f10027b 100755
--- a/src/gl-emergency-addkey
+++ b/src/gl-emergency-addkey
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # what/why: re-establish gitolite admin access when admin key(s) lost
 # where:    on server (NOT client!)
@@ -20,7 +20,7 @@
 
 # ENDHELP
 
-[[ -z $1 ]] && { perl -pe "s(\\\$0)($0); last if /ENDHELP/" < $0; exit 1; }
+[ -z "$1" ] && { perl -pe "s(\\\$0)($0); last if /ENDHELP/" < $0; exit 1; }
 
 set -e
 
diff --git a/src/gl-system-install b/src/gl-system-install
index b71cde9..5db21f3 100755
--- a/src/gl-system-install
+++ b/src/gl-system-install
@@ -39,7 +39,7 @@ if git rev-parse --is-inside-work-tree >/dev/null 2>&1
 then
     git describe --tags --long HEAD 2>/dev/null > conf/VERSION || die "git describe failed -- this should not happen!"
 else
-    [[ -f conf/VERSION ]] || echo '(unknown)' > conf/VERSION
+    [ -f conf/VERSION ] || echo '(unknown)' > conf/VERSION
 fi
 
 cp -R conf/* $gl_conf_dir || die "cp conf/* to $gl_conf_dir failed"