To trace of all system calls made command free -h
$ strace free -h
$ strace df -Th
To Trace Linux Process PID
$ sudo strace -p <PID>
To get summary of linux process
$ sudo strace -c -p <PID>
To Print Instruction Pointer During System Call
$ sudo strace -i df -Th
$ sudo strace -i free -h
To show Time of Day For Each Trace Output Line
$ sudo strace -t df -Th
$ sudo strace -t free -h
To Print Command Time Spent in System Calls
$ sudo strace -T df -Th
$ sudo strace -T free -h
To trace Only Specific System Calls
$ sudo strace -e trace=write df -Th
$ sudo strace -e trace=write free -h
$ sudo strace -e trace=all df -Th
$ sudo strace -e trace=all free -h
To trace System Calls Based on a Certain Condition
To trace all system calls involving process management
$ sudo strace -q -e trace=process df -Th
$ sudo strace -q -e trace=process free -h
To trace all system calls that take a filename as an argument,
$ sudo strace -q -e trace=file df -Th
$ sudo strace -q -e trace=file free -h
To trace all system calls involving memory mapping
$ sudo strace -q -e trace=memory df -Th
$ sudo strace -q -e trace=memory free -h
To redirect Trace Output to File
$ sudo strace -o df_debug.txt df -Th
$ sudo strace -o free_debug.txt free -h
To show debugging information for strace
$ strace -d df -Th
$ strace -d free -h
regards,
T.Dhanasekar