摘要:
registers Register Purpose Saved across calls %rax temp register; return value No %rbx callee-saved Yes %rcx used to pass 4th argument to functions No 阅读全文
摘要:
在 bash 中,下面两个变量有特殊含义 $$ is the current script's pid $! is the pid of the last background process #!/bin/bash ./other.sh > /dev/null 2>&1 & proc_pid=$! 阅读全文