ttcn3-tcpdump-start.sh: don't hardcode binary paths
After replacing debian-stretch-titan with debian-bullseye-titan, tcpdump
does not run anymore, the binary is in /usr/bin and not in /usr/sbin.
Related: OS#4969
Change-Id: I18c88c45c7522c1120ca42cd48d67fe8f155cd39
diff --git a/ttcn3-tcpdump-start.sh b/ttcn3-tcpdump-start.sh
index e905d8a..9b7a8b5 100755
--- a/ttcn3-tcpdump-start.sh
+++ b/ttcn3-tcpdump-start.sh
@@ -1,11 +1,11 @@
#!/bin/sh
PIDFILE_PCAP=/tmp/pcap.pid
-TCPDUMP=/usr/sbin/tcpdump
-DUMPCAP=/usr/bin/dumpcap
+TCPDUMP=$(command -v tcpdump)
+DUMPCAP=$(command -v dumpcap)
PIDFILE_NETCAT=/tmp/netcat.pid
-NETCAT=/bin/nc
+NETCAT=$(command -v nc)
GSMTAP_PORT=4729
TESTCASE=$1