diff --git a/completions/django.completion.sh b/completions/django.completion.sh
index 24a5b73..7101607 100644
--- a/completions/django.completion.sh
+++ b/completions/django.completion.sh
@@ -44,10 +44,10 @@ _python_django_completion()
 {
     if [[ ${COMP_CWORD} -ge 2 ]]; then
         PYTHON_EXE=$( basename -- ${COMP_WORDS[0]} )
-        echo $PYTHON_EXE | egrep "python([2-9]\.[0-9])?" >/dev/null 2>&1
+        echo $PYTHON_EXE | command grep -E "python([2-9]\.[0-9])?" >/dev/null 2>&1
         if [[ $? == 0 ]]; then
             PYTHON_SCRIPT=$( basename -- ${COMP_WORDS[1]} )
-            echo $PYTHON_SCRIPT | egrep "manage\.py|django-admin(\.py)?" >/dev/null 2>&1
+            echo $PYTHON_SCRIPT | command grep -E "manage\.py|django-admin(\.py)?" >/dev/null 2>&1
             if [[ $? == 0 ]]; then
                 COMPREPLY=( $( COMP_WORDS="${COMP_WORDS[*]:1}" \
                                COMP_CWORD=$(( COMP_CWORD-1 )) \
diff --git a/completions/fabric-completion.sh b/completions/fabric-completion.sh
index 4653a46..8139d13 100644
--- a/completions/fabric-completion.sh
+++ b/completions/fabric-completion.sh
@@ -91,7 +91,7 @@ function __fab_completion() {
         -*)
             if [[ -z "${__FAB_COMPLETION_LONG_OPT}" ]]; then
                 export __FAB_COMPLETION_LONG_OPT=$(
-                    fab --help | egrep -o "\-\-[A-Za-z_\-]+\=?" | sort -u)
+                    fab --help | command grep -Eo "\-\-[A-Za-z_\-]+\=?" | sort -u)
             fi
             opts="${__FAB_COMPLETION_LONG_OPT}"
             ;;
@@ -101,7 +101,7 @@ function __fab_completion() {
         # -*)
         #     if [[ -z "${__FAB_COMPLETION_SHORT_OPT}" ]]; then
         #         export __FAB_COMPLETION_SHORT_OPT=$(
-        #             fab --help | egrep -o "^ +\-[A-Za-z_\]" | sort -u)
+        #             fab --help | command grep -Eo "^ +\-[A-Za-z_\]" | sort -u)
         #     fi
         #     opts="${__FAB_COMPLETION_SHORT_OPT}"
         #     ;;
diff --git a/completions/vault.completion.sh b/completions/vault.completion.sh
index ab42898..e1a540a 100644
--- a/completions/vault.completion.sh
+++ b/completions/vault.completion.sh
@@ -17,7 +17,7 @@ function _vault_mounts() {
 }
 
 function _vault() {
-  local VAULT_COMMANDS=$(vault 2>&1 | egrep '^ +' | awk '{print $1}')
+  local VAULT_COMMANDS=$(vault 2>&1 | command grep -E '^ +' | awk '{print $1}')
 
   local cur
   local prev
diff --git a/lib/grep.sh b/lib/grep.sh
index 43d8d4a..a90f5fe 100644
--- a/lib/grep.sh
+++ b/lib/grep.sh
@@ -24,8 +24,11 @@ fi
 # export grep settings
 if ((${#_omb_grep_options[@]} > 0)); then
   _omb_util_alias grep="grep ${_omb_grep_options[*]}"
-  _omb_util_alias fgrep="fgrep ${_omb_grep_options[*]}"
-  _omb_util_alias egrep="egrep ${_omb_grep_options[*]}"
+  _omb_util_alias fgrep="grep -F ${_omb_grep_options[*]}"
+  _omb_util_alias egrep="grep -E ${_omb_grep_options[*]}"
+else
+  _omb_util_alias fgrep='grep -F'
+  _omb_util_alias egrep='grep -E'
 fi
 
 # clean up
diff --git a/themes/brainy/brainy.theme.sh b/themes/brainy/brainy.theme.sh
index 6a96ff7..46ee97f 100644
--- a/themes/brainy/brainy.theme.sh
+++ b/themes/brainy/brainy.theme.sh
@@ -139,7 +139,7 @@ ___brainy_prompt_todo() {
 	_omb_util_binary_exists todo.sh || return
 	color=$_omb_prompt_bold_white
 	box="[|]"
-	info="t:$(todo.sh ls | egrep "TODO: [0-9]+ of ([0-9]+)" | awk '{ print $4 }' )"
+	info="t:$(todo.sh ls | command grep -E "TODO: [0-9]+ of ([0-9]+)" | awk '{ print $4 }' )"
 	printf "%s|%s|%s|%s" "${color}" "${info}" "${_omb_prompt_bold_green}" "${box}"
 }