跟踪进程从一个shell脚本开始

除非我误解了你的问题，如果你需要更多的细节，你不能使用'bash -x main_script'或'strace -f ./main_script'吗？

testing脚本：

 [user@host ~]$ cat test.sh && cat script1 #!/bin/bash ./script1 #!/bin/bash echo 'hi!' 

bash -x

 [user@host ~]$ bash -x test.sh + ./script1 hi! 

或strace -f

 [user@host ~]$ strace -f ./test.sh execve("./test.sh", ["./test.sh"], [/* 24 vars */]) = 0 brk(0) = 0x143a000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fab27a000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=17630, ...}) = 0 mmap(NULL, 17630, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1fab272000 close(3) = 0 open("/lib64/libtinfo.so.5", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\310\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=135896, ...}) = 0 mmap(NULL, 2232320, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1faae37000 mprotect(0x7f1faae54000, 2097152, PROT_NONE) = 0 mmap(0x7f1fab054000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1d000) = 0x7f1fab054000 close(3) = 0 open("/lib64/libdl.so.2", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\r\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=19536, ...}) = 0 mmap(NULL, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1faac33000 mprotect(0x7f1faac35000, 2097152, PROT_NONE) = 0 mmap(0x7f1faae35000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f1faae35000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\1\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1916568, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fab271000 mmap(NULL, 3745960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1faa8a0000 mprotect(0x7f1faaa2a000, 2093056, PROT_NONE) = 0 mmap(0x7f1faac29000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x189000) = 0x7f1faac29000 mmap(0x7f1faac2e000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1faac2e000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fab270000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fab26f000 arch_prctl(ARCH_SET_FS, 0x7f1fab270700) = 0 mprotect(0x7f1faac29000, 16384, PROT_READ) = 0 mprotect(0x7f1faae35000, 4096, PROT_READ) = 0 mprotect(0x7f1fab277000, 4096, PROT_READ) = 0 munmap(0x7f1fab272000, 17630) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 open("/dev/tty", O_RDWR|O_NONBLOCK) = 3 close(3) = 0 brk(0) = 0x143a000 brk(0x145b000) = 0x145b000 open("/usr/lib/locale/locale-archive", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=99158576, ...}) = 0 mmap(NULL, 99158576, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1fa4a0f000 close(3) = 0 getuid() = 500 getgid() = 500 geteuid() = 500 getegid() = 500 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 open("/proc/meminfo", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fab276000 read(3, "MemTotal: 3923232 kB\nMemF"..., 1024) = 1024 close(3) = 0 munmap(0x7f1fab276000, 4096) = 0 rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigaction(SIGQUIT, {SIG_IGN, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 uname({sys="Linux", node="host.example.com", ...}) = 0 stat("/home/user", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat(".", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 getpid() = 28822 open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=26060, ...}) = 0 mmap(NULL, 26060, PROT_READ, MAP_SHARED, 3, 0) = 0x7f1fab268000 close(3) = 0 getppid() = 28819 getpgrp() = 28819 rt_sigaction(SIGCHLD, {0x43f2b0, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 getrlimit(RLIMIT_NPROC, {rlim_cur=1024, rlim_max=30504}) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 open("./test.sh", O_RDONLY) = 3 ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffecf31ec0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(3, 0, SEEK_CUR) = 0 read(3, "#!/bin/bash\n./script1\n", 80) = 22 lseek(3, 0, SEEK_SET) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=4*1024}) = 0 fcntl(255, F_GETFD) = -1 EBADF (Bad file descriptor) dup2(3, 255) = 255 close(3) = 0 fcntl(255, F_SETFD, FD_CLOEXEC) = 0 fcntl(255, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(255, {st_mode=S_IFREG|0755, st_size=22, ...}) = 0 lseek(255, 0, SEEK_CUR) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(255, "#!/bin/bash\n./script1\n", 22) = 22 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0 clone(Process 28823 attached (waiting for parent) Process 28823 resumed (parent 28822 ready) child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f1fab2709d0) = 28823 [pid 28822] rt_sigprocmask(SIG_SETMASK, [], <unfinished ...> [pid 28823] close(255 <unfinished ...> [pid 28822] <... rt_sigprocmask resumed> NULL, 8) = 0 [pid 28823] <... close resumed> ) = 0 [pid 28822] rt_sigprocmask(SIG_BLOCK, [CHLD], <unfinished ...> [pid 28823] rt_sigprocmask(SIG_SETMASK, [], <unfinished ...> [pid 28822] <... rt_sigprocmask resumed> [], 8) = 0 [pid 28823] <... rt_sigprocmask resumed> NULL, 8) = 0 [pid 28822] rt_sigprocmask(SIG_SETMASK, [], <unfinished ...> [pid 28823] rt_sigaction(SIGTSTP, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, <unfinished ...> [pid 28822] <... rt_sigprocmask resumed> NULL, 8) = 0 [pid 28823] <... rt_sigaction resumed> {SIG_DFL, [], 0}, 8) = 0 [pid 28822] rt_sigprocmask(SIG_BLOCK, [CHLD], <unfinished ...> [pid 28823] rt_sigaction(SIGTTIN, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, <unfinished ...> [pid 28822] <... rt_sigprocmask resumed> [], 8) = 0 [pid 28823] <... rt_sigaction resumed> {SIG_DFL, [], 0}, 8) = 0 [pid 28822] rt_sigaction(SIGINT, {0x43d060, [], SA_RESTORER, 0x7f1faa8d2920}, <unfinished ...> [pid 28823] rt_sigaction(SIGTTOU, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, <unfinished ...> [pid 28822] <... rt_sigaction resumed> {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 [pid 28823] <... rt_sigaction resumed> {SIG_DFL, [], 0}, 8) = 0 [pid 28822] wait4(-1, <unfinished ...> [pid 28823] rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 [pid 28823] rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {SIG_IGN, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 [pid 28823] rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {0x43f2b0, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 [pid 28823] execve("./script1", ["./script1"], [/* 24 vars */]) = 0 [pid 28823] brk(0) = 0x1d79000 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420c9000 [pid 28823] access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) [pid 28823] open("/etc/ld.so.cache", O_RDONLY) = 3 [pid 28823] fstat(3, {st_mode=S_IFREG|0644, st_size=17630, ...}) = 0 [pid 28823] mmap(NULL, 17630, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fbd420c1000 [pid 28823] close(3) = 0 [pid 28823] open("/lib64/libtinfo.so.5", O_RDONLY) = 3 [pid 28823] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\310\0\0\0\0\0\0"..., 832) = 832 [pid 28823] fstat(3, {st_mode=S_IFREG|0755, st_size=135896, ...}) = 0 [pid 28823] mmap(NULL, 2232320, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fbd41c86000 [pid 28823] mprotect(0x7fbd41ca3000, 2097152, PROT_NONE) = 0 [pid 28823] mmap(0x7fbd41ea3000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1d000) = 0x7fbd41ea3000 [pid 28823] close(3) = 0 [pid 28823] open("/lib64/libdl.so.2", O_RDONLY) = 3 [pid 28823] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\r\0\0\0\0\0\0"..., 832) = 832 [pid 28823] fstat(3, {st_mode=S_IFREG|0755, st_size=19536, ...}) = 0 [pid 28823] mmap(NULL, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fbd41a82000 [pid 28823] mprotect(0x7fbd41a84000, 2097152, PROT_NONE) = 0 [pid 28823] mmap(0x7fbd41c84000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fbd41c84000 [pid 28823] close(3) = 0 [pid 28823] open("/lib64/libc.so.6", O_RDONLY) = 3 [pid 28823] read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\1\0\0\0\0\0"..., 832) = 832 [pid 28823] fstat(3, {st_mode=S_IFREG|0755, st_size=1916568, ...}) = 0 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420c0000 [pid 28823] mmap(NULL, 3745960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fbd416ef000 [pid 28823] mprotect(0x7fbd41879000, 2093056, PROT_NONE) = 0 [pid 28823] mmap(0x7fbd41a78000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x189000) = 0x7fbd41a78000 [pid 28823] mmap(0x7fbd41a7d000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fbd41a7d000 [pid 28823] close(3) = 0 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420bf000 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420be000 [pid 28823] arch_prctl(ARCH_SET_FS, 0x7fbd420bf700) = 0 [pid 28823] mprotect(0x7fbd41a78000, 16384, PROT_READ) = 0 [pid 28823] mprotect(0x7fbd41c84000, 4096, PROT_READ) = 0 [pid 28823] mprotect(0x7fbd420c6000, 4096, PROT_READ) = 0 [pid 28823] munmap(0x7fbd420c1000, 17630) = 0 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] open("/dev/tty", O_RDWR|O_NONBLOCK) = 3 [pid 28823] close(3) = 0 [pid 28823] brk(0) = 0x1d79000 [pid 28823] brk(0x1d9a000) = 0x1d9a000 [pid 28823] open("/usr/lib/locale/locale-archive", O_RDONLY) = 3 [pid 28823] fstat(3, {st_mode=S_IFREG|0644, st_size=99158576, ...}) = 0 [pid 28823] mmap(NULL, 99158576, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fbd3b85e000 [pid 28823] close(3) = 0 [pid 28823] getuid() = 500 [pid 28823] getgid() = 500 [pid 28823] geteuid() = 500 [pid 28823] getegid() = 500 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] open("/proc/meminfo", O_RDONLY) = 3 [pid 28823] fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420c5000 [pid 28823] read(3, "MemTotal: 3923232 kB\nMemF"..., 1024) = 1024 [pid 28823] close(3) = 0 [pid 28823] munmap(0x7fbd420c5000, 4096) = 0 [pid 28823] rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], 0}, 8) = 0 [pid 28823] rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, 8) = 0 [pid 28823] rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], 0}, 8) = 0 [pid 28823] rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, 8) = 0 [pid 28823] rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], 0}, 8) = 0 [pid 28823] rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, 8) = 0 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] rt_sigaction(SIGQUIT, {SIG_IGN, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, 8) = 0 [pid 28823] uname({sys="Linux", node="host.example.com", ...}) = 0 [pid 28823] stat("/home/user", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 [pid 28823] stat(".", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 [pid 28823] getpid() = 28823 [pid 28823] open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3 [pid 28823] fstat(3, {st_mode=S_IFREG|0644, st_size=26060, ...}) = 0 [pid 28823] mmap(NULL, 26060, PROT_READ, MAP_SHARED, 3, 0) = 0x7fbd420b7000 [pid 28823] close(3) = 0 [pid 28823] getppid() = 28822 [pid 28823] getpgrp() = 28819 [pid 28823] rt_sigaction(SIGCHLD, {0x43f2b0, [], SA_RESTORER, 0x7fbd41721920}, {SIG_DFL, [], SA_RESTORER, 0x7fbd41721920}, 8) = 0 [pid 28823] getrlimit(RLIMIT_NPROC, {rlim_cur=1024, rlim_max=30504}) = 0 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] open("./script1", O_RDONLY) = 3 [pid 28823] ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff325f2a00) = -1 ENOTTY (Inappropriate ioctl for device) [pid 28823] lseek(3, 0, SEEK_CUR) = 0 [pid 28823] read(3, "#!/bin/bash\necho 'hi!'\n", 80) = 23 [pid 28823] lseek(3, 0, SEEK_SET) = 0 [pid 28823] getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=4*1024}) = 0 [pid 28823] fcntl(255, F_GETFD) = -1 EBADF (Bad file descriptor) [pid 28823] dup2(3, 255) = 255 [pid 28823] close(3) = 0 [pid 28823] fcntl(255, F_SETFD, FD_CLOEXEC) = 0 [pid 28823] fcntl(255, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) [pid 28823] fstat(255, {st_mode=S_IFREG|0755, st_size=23, ...}) = 0 [pid 28823] lseek(255, 0, SEEK_CUR) = 0 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] read(255, "#!/bin/bash\necho 'hi!'\n", 23) = 23 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 [pid 28823] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd420b6000 [pid 28823] write(1, "hi!\n", 4hi! ) = 4 [pid 28823] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 [pid 28823] read(255, "", 23) = 0 [pid 28823] exit_group(0) = ? Process 28823 detached <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 28823 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- wait4(-1, 0x7fffecf3195c, WNOHANG, NULL) = -1 ECHILD (No child processes) rt_sigreturn(0xffffffffffffffff) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f1faa8d2920}, {0x43d060, [], SA_RESTORER, 0x7f1faa8d2920}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(255, "", 22) = 0 exit_group(0) = ? 

如果您知道衍生subprocess的父PID，则可以列出它们

 pgrep -P PPID 

您可以在脚本中使用“$$”variables来获取当前shell。

或者你可以尝试使用“$！” “wrapper”行后面的variables，展开为最近执行的后台命令的PID。