diff --git a/src/index.ts b/src/index.ts
index 91e2ae9..88bd251 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -466,6 +466,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 `
diff --git a/test/__snapshots__/e2e.test.js.snap b/test/__snapshots__/e2e.test.js.snap
index 1f4d141..ac9ebbf 100644
--- a/test/__snapshots__/e2e.test.js.snap
+++ b/test/__snapshots__/e2e.test.js.snap
@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
 exports[`create a command shim for a .exe file 1`] = `
 "#!/bin/sh
diff --git a/test/__snapshots__/test.js.snap b/test/__snapshots__/test.js.snap
index 7b2edf7..e335a86 100644
--- a/test/__snapshots__/test.js.snap
+++ b/test/__snapshots__/test.js.snap
@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
 exports[`batch script bat.shim 1`] = `
 "#!/bin/sh
@@ -10,6 +10,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/cmd" ]; then
@@ -73,6 +89,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 "/.pnpm/nodejs/16.0.0/node"  "$basedir/src.env" "$@"
@@ -116,6 +148,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/node" ]; then
@@ -179,6 +227,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -z "$NODE_PATH" ]; then
@@ -265,6 +329,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 export PATH="/add-to-path:$PATH"
@@ -340,6 +420,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/node" ]; then
@@ -403,6 +499,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/node" ]; then
@@ -466,6 +578,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/node" ]; then
@@ -529,6 +657,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir//usr/bin/sh" ]; then
@@ -592,6 +736,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir//usr/bin/sh" ]; then
@@ -664,17 +824,6 @@ else
 fi
 `;
 
-exports[`explicit shebang with args, linking to another drive on Windows sh.args.shim.CMD 1`] = `
-"@SETLOCAL
-@IF EXIST "%~dp0\\/usr/bin/sh.exe" (
-  "%~dp0\\/usr/bin/sh.exe"  -x "J:\\cmd-shim\\fixtures\\src.sh.args" %*
-) ELSE (
-  @SET PATHEXT=%PATHEXT:;.JS;=;%
-  /usr/bin/sh  -x "J:\\cmd-shim\\fixtures\\src.sh.args" %*
-)
-"
-`;
-
 exports[`explicit shebang with args, linking to another drive on Windows sh.args.shim.ps1 1`] = `
 "#!/usr/bin/env pwsh
 $basedir=Split-Path $MyInvocation.MyCommand.Definition -Parent
@@ -717,6 +866,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir//usr/bin/sh" ]; then
@@ -780,6 +945,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 "$basedir/src.exe"   "$@"
@@ -817,6 +998,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 "$basedir/src.exe"   "$@"
@@ -860,6 +1057,22 @@ case \`uname\` in
             basedir=\`cygpath -w "$basedir"\`
         fi
     ;;
+    *)
+      if command -v realpath >/dev/null 2>&1; then
+          basedir=\`realpath "$basedir"\`
+      elif command -v readlink >/dev/null 2>&1; then
+          # some systems has the readlink, but doesn't have "-f" flag
+          if readlink -f "$basedir" >/dev/null 2>&1; then
+               basedir=\`readlink -f "$basedir"\`
+          else
+               basedir=\`readlink "$basedir"\`
+          fi
+      elif command -v perl >/dev/null 2>&1; then
+          basedir=\`perl -e 'use Cwd "abs_path"; print abs_path(shift)' "$basedir"\`
+      elif [[ $basedir != /* ]]; then
+          basedir="$PWD/\${basedir#./}"
+      fi
+    ;;
 esac
 
 if [ -x "$basedir/node" ]; then