1 The following are examples of sh_flow.d. 2 3 This is a simple script to trace the flow of Bourne shell functions, 4 builtins and external commands. Here it traces the example program, 5 Code/Shell/func_abc.sh. 6 7 # sh_flow.d 8 C TIME(us) FILE -- NAME 9 0 3060274370505 func_abc.sh -> func_a 10 0 3060274370529 func_abc.sh > echo 11 0 3060274372742 func_abc.sh | sleep 12 0 3060275381634 func_abc.sh -> func_b 13 0 3060275381660 func_abc.sh > echo 14 0 3060275383852 func_abc.sh | sleep 15 0 3060276391653 func_abc.sh -> func_c 16 0 3060276391679 func_abc.sh > echo 17 0 3060276393671 func_abc.sh | sleep 18 0 3060277401753 func_abc.sh <- func_c 19 0 3060277401767 func_abc.sh <- func_b 20 0 3060277401775 func_abc.sh <- func_a 21 ^C 22 23 As each function is entered, the third column is indented by 2 spaces. This 24 shows which function is calling who - the output abovebegins by showing that 25 func_a() began, and then called func_b(). 26 27 If the output looks shuffled, check the CPU "C" and "TIME" columns, and 28 post sort based on TIME if necessary. 29 30 See Notes/ALLflow_notes.txt for important notes about reading flow outputs. 31 32 33 34 The following traces the firefox startup script. 35 36 # sh_flow.d 37 C TIME(us) FILE -- NAME 38 0 3060321598138 firefox > test 39 0 3060321603730 firefox > [ 40 0 3060321603796 firefox > cd 41 0 3060321603878 firefox > [ 42 0 3060321603900 firefox > [ 43 0 3060321604099 firefox > [ 44 0 3060321609050 firefox > echo 45 0 3060321620601 firefox > echo 46 0 3060321626369 firefox > [ 47 0 3060321626432 firefox > export 48 0 3060321626459 firefox -> moz_pis_startstop_scripts 49 0 3060321626519 firefox > export 50 0 3060321626966 firefox > [ 51 0 3060321627031 firefox > . 52 0 3060321628446 firefox -> moz_spc_verbose_echo 53 0 3060321628458 firefox > : 54 0 3060321628467 firefox <- moz_spc_verbose_echo 55 0 3060321636461 firefox > [ 56 0 3060321636738 firefox -> moz_spc_verbose_echo 57 0 3060321636751 firefox > : 58 0 3060321636760 firefox <- moz_spc_verbose_echo 59 0 3060321636778 firefox > [ 60 0 3060321636793 firefox > [ 61 0 3060321636817 firefox > [ 62 0 3060321637126 firefox -> moz_spc_verbose_echo 63 0 3060321637136 firefox > : 64 0 3060321637143 firefox <- moz_spc_verbose_echo 65 0 3060321666922 firefox -> moz_spc_verbose_echo 66 0 3060321666952 firefox > : 67 0 3060321666964 firefox <- moz_spc_verbose_echo 68 0 3060321674929 firefox > [ 69 0 3060321680246 firefox > [ 70 0 3060321680312 firefox -> moz_spc_verbose_echo 71 0 3060321680323 firefox > : 72 0 3060321680331 firefox <- moz_spc_verbose_echo 73 0 3060321680356 firefox -> moz_spc_verbose_echo 74 0 3060321680363 firefox > : 75 0 3060321680370 firefox <- moz_spc_verbose_echo 76 0 3060321680396 firefox > [ 77 0 3060321680428 firefox <- moz_pis_startstop_scripts 78 0 3060321680525 firefox > [ 79 0 3060321680580 firefox > [ 80 0 3060321685358 firefox | /usr/lib/firefox/run-mozilla.sh 81 0 3060321700731 run-mozilla.sh > [ 82 0 3060321700950 run-mozilla.sh > break 83 0 3060321703259 run-mozilla.sh > [ 84 0 3060321703292 run-mozilla.sh > shift 85 0 3060321703382 run-mozilla.sh > [ 86 0 3060321703421 run-mozilla.sh > [ 87 0 3060321703493 run-mozilla.sh > [ 88 0 3060321703642 run-mozilla.sh > [ 89 0 3060321703669 run-mozilla.sh > export 90 0 3060321703706 run-mozilla.sh > [ 91 0 3060321703725 run-mozilla.sh > [ 92 0 3060321703857 run-mozilla.sh > [ 93 0 3060321703880 run-mozilla.sh > export 94 0 3060321703925 run-mozilla.sh > export 95 0 3060321703954 run-mozilla.sh > [ 96 0 3060321703982 run-mozilla.sh -> moz_run_program 97 0 3060321704013 run-mozilla.sh > [ 98 0 3060321704049 run-mozilla.sh -> moz_test_binary 99 0 3060321704065 run-mozilla.sh > [ 100 0 3060321704097 run-mozilla.sh > [ 101 0 3060321704127 run-mozilla.sh > return 102 0 3060321704137 run-mozilla.sh <- moz_test_binary 103 0 3060321704151 run-mozilla.sh > [ 104 0 3060321709953 run-mozilla.sh > type 105 0 3060321724260 run-mozilla.sh > [ 106 0 3060321724559 run-mozilla.sh > [ 107 0 3060321724574 run-mozilla.sh > [ 108 0 3060321727396 run-mozilla.sh | /usr/lib/firefox/firefox-bin 109 0 3060325513871 run-mozilla.sh > [ 110 0 3060325513898 run-mozilla.sh > [ 111 0 3060325513929 run-mozilla.sh > [ 112 0 3060325513940 run-mozilla.sh <- moz_run_program 113 0 3060325513967 run-mozilla.sh > exit 114 0 3060325515113 firefox -> moz_pis_startstop_scripts 115 0 3060325515189 firefox > export 116 0 3060325515431 firefox > [ 117 0 3060325515466 firefox > [ 118 0 3060325515487 firefox <- moz_pis_startstop_scripts 119 0 3060325515503 firefox > exit 120 121 This shows the flow, incluing the handover between the "firefox" script 122 and the "run-mozilla.sh" script. 123 124 There is a point in the output where flow appears to reverse (at time 125 3060321709953, with the entry "> type"). This is due to another instance 126 of the run-mozilla.sh script running, which is indistinguishable from 127 the other lines in the output. To confirm this for yourself, add a PID 128 column to the flow script (or use sh_flowinfo.d). 129 130
Indexes created Mon Apr 20 00:23:12 UTC 2026