Add cheatsheet for strace

cheatsheets/strace

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+# Basic stracing
+strace <command>
+
+# save the trace to a file
+strace -o strace.out <other switches> <command>
+
+# follow only the open() system call
+strace -e trace=open <command>
+
+# follow all the system calls which open a file
+strace -e trace=file <command>
+
+# follow all the system calls associated with process
+# management
+strace -e trace=process <command>
+
+# follow child processes as they are created
+strace -f <command>
+
+# count time, calls and errors for each system call
+strace -c <command>
+
+# trace a running process (multiple PIDs can be specified)
+strace -p <pid>