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|
The following are examples of sh_syscolors.d.
This is a simple script to trace the flow of Shell functions, lines, and
system calls made. It renders the output in color ("colour") using terminal
escape sequences (which you can tweak by modifying the script).
Here it traces the example program, Code/Shell/func_abc.sh.
WARNING: This output is full of terminal escape sequences, so if you are
trying to view this through an editor or web browser - it may look awful.
Try viewing this using "more" (although, depending on your terminal, it
still may look awful).
# sh_syscolors.d -c ./func_abc.sh -o /tmp/out
Function A
Function B
Function C
# cat /tmp/out
C PID DELTA(us) FILE:LINE TYPE -- NAME
[2;32m0 12979 2 func_abc.sh:- syscall -> munmap[0m
[2;32m0 12979 35 func_abc.sh:- syscall <- munmap[0m
[2;32m0 12979 56 func_abc.sh:- syscall -> mmap[0m
[2;32m0 12979 18 func_abc.sh:- syscall <- mmap[0m
[2;32m0 12979 40 func_abc.sh:- syscall -> setcontext[0m
[2;32m0 12979 11 func_abc.sh:- syscall <- setcontext[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> getrlimit[0m
[2;32m0 12979 11 func_abc.sh:- syscall <- getrlimit[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> getpid[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- getpid[0m
[2;32m0 12979 61 func_abc.sh:- syscall -> setcontext[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- setcontext[0m
[2;32m0 12979 865 func_abc.sh:- syscall -> sysi86[0m
[2;32m0 12979 14 func_abc.sh:- syscall <- sysi86[0m
[2;32m0 12979 84 func_abc.sh:- syscall -> open64[0m
[2;32m0 12979 89 func_abc.sh:- syscall <- open64[0m
[2;32m0 12979 14 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 35 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 15 func_abc.sh:- syscall -> close[0m
[2;32m0 12979 16 func_abc.sh:- syscall <- close[0m
[2;32m0 12979 119 func_abc.sh:- syscall -> getpid[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- getpid[0m
[2;32m0 12979 17 func_abc.sh:- syscall -> setpgrp[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- setpgrp[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> setpgrp[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- setpgrp[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> access[0m
[2;32m0 12979 20 func_abc.sh:- syscall <- access[0m
[2;32m0 12979 15 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 11 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 15 func_abc.sh:- syscall -> sysconfig[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sysconfig[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sysconfig[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sysconfig[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> sigaltstack[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaltstack[0m
[2;32m0 12979 16 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> sigaction[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- sigaction[0m
[2;32m0 12979 61 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 13 func_abc.sh:- syscall -> getuid[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- getuid[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> getuid[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- getuid[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> getgid[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- getgid[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> getgid[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- getgid[0m
[2;32m0 12979 15 func_abc.sh:- syscall -> open64[0m
[2;32m0 12979 19 func_abc.sh:- syscall <- open64[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> close[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- close[0m
[2;32m0 12979 24 func_abc.sh:- syscall -> fcntl[0m
[2;32m0 12979 23 func_abc.sh:- syscall <- fcntl[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> close[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- close[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> fcntl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- fcntl[0m
[2;32m0 12979 28 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 42 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 14 func_abc.sh:- syscall -> read[0m
[2;32m0 12979 33 func_abc.sh:- syscall <- read[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 21 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 19 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> read[0m
[2;32m0 12979 15 func_abc.sh:- syscall <- read[0m
[2;32m0 12979 28 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 8 func_abc.sh:- syscall <- brk[0m
[1;35m0 12979 14 func_abc.sh:23 line -- [0m
[2;35m0 12979 32 func_abc.sh:23 func -> func_a[0m
[1;35m0 12979 16 func_abc.sh:18 line -- [0m
[2;35m0 12979 18 func_abc.sh:18 builtin -> echo[0m
[2;32m0 12979 21 func_abc.sh:- syscall -> write[0m
[2;32m0 12979 33 func_abc.sh:- syscall <- write[0m
[2;35m0 12979 311 func_abc.sh:0 builtin <- echo[0m
[1;35m0 12979 65 func_abc.sh:19 line -- [0m
[2;32m0 12979 17 func_abc.sh:- syscall -> getuid[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- getuid[0m
[2;32m0 12979 15 func_abc.sh:- syscall -> stat64[0m
[2;32m0 12979 25 func_abc.sh:- syscall <- stat64[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> access[0m
[2;32m0 12979 15 func_abc.sh:- syscall <- access[0m
[2;32m0 12979 18 func_abc.sh:- syscall -> schedctl[0m
[2;32m0 12979 46 func_abc.sh:- syscall <- schedctl[0m
[2;32m0 12979 220 func_abc.sh:- syscall -> fork1[0m
[2;32m0 12979 258957 func_abc.sh:- syscall <- fork1[0m
[2;32m0 12979 244 func_abc.sh:- syscall -> lwp_sigmask[0m
[2;32m0 12979 16 func_abc.sh:- syscall <- lwp_sigmask[0m
[2;35m0 12979 31 func_abc.sh:19 cmd -> sleep[0m
[2;32m0 12979 53 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 1008036 func_abc.sh:- syscall <- waitsys[0m
[2;32m0 12979 38 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 18 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> setpgrp[0m
[2;32m0 12979 10 func_abc.sh:- syscall <- setpgrp[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 37 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 26 func_abc.sh:- syscall <- waitsys[0m
[2;35m0 12979 14 func_abc.sh:0 cmd <- sleep[0m
[1;35m0 12979 21 func_abc.sh:20 line -- [0m
[2;35m0 12979 28 func_abc.sh:20 func -> func_b[0m
[1;35m0 12979 15 func_abc.sh:11 line -- [0m
[2;35m0 12979 17 func_abc.sh:11 builtin -> echo[0m
[2;32m0 12979 19 func_abc.sh:- syscall -> write[0m
[2;32m0 12979 33 func_abc.sh:- syscall <- write[0m
[2;35m0 12979 310 func_abc.sh:0 builtin <- echo[0m
[1;35m0 12979 16 func_abc.sh:12 line -- [0m
[2;32m0 12979 226 func_abc.sh:- syscall -> fork1[0m
[2;32m0 12979 64931 func_abc.sh:- syscall <- fork1[0m
[2;32m0 12979 262 func_abc.sh:- syscall -> lwp_sigmask[0m
[2;32m0 12979 16 func_abc.sh:- syscall <- lwp_sigmask[0m
[2;35m0 12979 31 func_abc.sh:12 cmd -> sleep[0m
[2;32m0 12979 31 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 1003941 func_abc.sh:- syscall <- waitsys[0m
[2;32m0 12979 30 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 19 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> setpgrp[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- setpgrp[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 38 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 26 func_abc.sh:- syscall <- waitsys[0m
[2;35m0 12979 14 func_abc.sh:0 cmd <- sleep[0m
[1;35m0 12979 33 func_abc.sh:13 line -- [0m
[2;35m0 12979 27 func_abc.sh:13 func -> func_c[0m
[1;35m0 12979 15 func_abc.sh:5 line -- [0m
[2;35m0 12979 17 func_abc.sh:5 builtin -> echo[0m
[2;32m0 12979 20 func_abc.sh:- syscall -> write[0m
[2;32m0 12979 33 func_abc.sh:- syscall <- write[0m
[2;35m0 12979 309 func_abc.sh:0 builtin <- echo[0m
[1;35m0 12979 17 func_abc.sh:6 line -- [0m
[2;32m0 12979 267 func_abc.sh:- syscall -> fork1[0m
[2;32m0 12979 64649 func_abc.sh:- syscall <- fork1[0m
[2;32m0 12979 257 func_abc.sh:- syscall -> lwp_sigmask[0m
[2;32m0 12979 16 func_abc.sh:- syscall <- lwp_sigmask[0m
[2;35m0 12979 31 func_abc.sh:6 cmd -> sleep[0m
[2;32m0 12979 31 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 1004183 func_abc.sh:- syscall <- waitsys[0m
[2;32m0 12979 31 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 18 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> setpgrp[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- setpgrp[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 38 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> waitsys[0m
[2;32m0 12979 27 func_abc.sh:- syscall <- waitsys[0m
[2;35m0 12979 14 func_abc.sh:0 cmd <- sleep[0m
[2;35m0 12979 32 func_abc.sh:- func <- func_c[0m
[2;35m0 12979 16 func_abc.sh:- func <- func_b[0m
[2;35m0 12979 10 func_abc.sh:- func <- func_a[0m
[2;32m0 12979 13 func_abc.sh:- syscall -> brk[0m
[2;32m0 12979 12 func_abc.sh:- syscall <- brk[0m
[2;32m0 12979 12 func_abc.sh:- syscall -> read[0m
[2;32m0 12979 16 func_abc.sh:- syscall <- read[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 10 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 9 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> close[0m
[2;32m0 12979 13 func_abc.sh:- syscall <- close[0m
[2;32m0 12979 37 func_abc.sh:- syscall -> open64[0m
[2;32m0 12979 105 func_abc.sh:- syscall <- open64[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall <- ioctl[0m
[2;32m0 12979 11 func_abc.sh:- syscall -> close[0m
[2;32m0 12979 15 func_abc.sh:- syscall <- close[0m
[2;32m0 12979 31 func_abc.sh:- syscall -> rexit[0m
Here you can see the output showing the path the script follows as it is
executed.
ie:
[1;35m0 12979 14 func_abc.sh:23 line -- [0m
[2;35m0 12979 32 func_abc.sh:23 func -> func_a[0m
[1;35m0 12979 16 func_abc.sh:18 line -- [0m
[2;35m0 12979 18 func_abc.sh:18 builtin -> echo[0m
[2;32m0 12979 21 func_abc.sh:- syscall -> write[0m
[2;32m0 12979 33 func_abc.sh:- syscall <- write[0m
[2;35m0 12979 311 func_abc.sh:0 builtin <- echo[0m
[1;35m0 12979 65 func_abc.sh:19 line -- [0m
shows that on CPU 0 we run func_a (which is line 23 of the example script),
where it uses the shell built-in echo command (on line 18 of the example
script) to write a line of text to the screen. You can see in column 3 (the
delta time) it takes 311 microseconds from when the write syscall finishes to
when the echo built-in completes its clean-up and finishes.
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