diff --git a/.hastest.bats b/.hastest.bats
index dc51503..05adb9c 100644
--- a/.hastest.bats
+++ b/.hastest.bats
@@ -142,3 +142,23 @@ teardown() {
   [[ "printf '%b\n' ${lines[0]}" =~ "${checkmark}" ]]
   [[ "printf '%b\n' ${lines[2]}" =~ '✗' ]]
 }
+
+@test "testing archiving commands" {
+  run $has tar unzip gzip xz unar pv
+
+  [ "$status" -eq 0 ]
+  [ "$(echo "${output}" | grep "tar")" ]
+  [ "$(echo "${output}" | grep "unzip")" ]
+  [ "$(echo "${output}" | grep "xz")" ]
+  [ "$(echo "${output}" | grep "unar")" ]
+  [ "$(echo "${output}" | grep "pv")" ]
+}
+
+@test "testing coreutils commands" {
+  run $has coreutils sed awk grep sudo file linux-utils
+
+  [ "$status" -eq 0 ]
+  [ "$(echo "${lines[0]}" | grep "gnu_coreutils")" ]
+  [ "$(echo "${lines[5]}" | grep "file")" ]
+  [ "$(echo "${lines[6]}" | grep "gnu_coreutils")" ]
+}
diff --git a/.travis.yml b/.travis.yml
index b592514..381aa2a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,9 @@ addons:
     update: true
     packages:
     - bc
+    - pv
+    - xz-utils
+    - unar
 
 env:
   global:
diff --git a/has b/has
index 328bba2..0564077 100755
--- a/has
+++ b/has
@@ -81,6 +81,7 @@ __detect(){
     homebrew) command="brew";;
     awsebcli) command="eb";;
     awscli) command="aws";;
+   *coreutils|linux-utils) command="gnu_coreutils" ;;
     *)      command=${name} ;;
   esac
 
@@ -94,6 +95,10 @@ __detect(){
     vim|emacs|nano|subl)    __dynamic_detect--version "${command}" ;;
     bats|tree|ack|autojump) __dynamic_detect--version "${command}" ;;
     jq|ag|brew)             __dynamic_detect--version "${command}" ;;
+    apt|apt-get|aptitude)   __dynamic_detect--version "${command}" ;;
+    sed|awk|grep|file|sudo) __dynamic_detect--version "${command}" ;;
+    gzip|xz|unar|bzip2)     __dynamic_detect--version "${command}" ;;
+    tar|pv)                 __dynamic_detect--version "${command}" ;;
 
     R)                      __dynamic_detect--version "${command}" ;;
     node|npm|yarn)          __dynamic_detect--version "${command}" ;;
@@ -105,6 +110,9 @@ __detect(){
     lein)                   __dynamic_detect--version "${command}" ;;
     aws|eb|sls|gcloud)      __dynamic_detect--version "${command}" ;;
 
+    # commands that need -v flag
+    unzip)                  __dynamic_detect-v "${command}" ;;
+
     # commands that need -version flag
     ant|java|javac)         __dynamic_detect-version "${command}" ;;
     scala|kotlin)           __dynamic_detect-version "${command}" ;;
@@ -142,6 +150,10 @@ __detect(){
       status=$?
       ;;
 
+    ## use 'readlink' to test for GNU coreutils
+    # readlink (GNU coreutils) 8.28
+    gnu_coreutils)    __dynamic_detect--version readlink ;;
+
     has)
       version=$(has 2>&1 | grep -Eo "${REGEX_SIMPLE_VERSION}" | head -1)
       status=$?