许多程序使用这个setuid位以root身份运行,以获取它们需要更改系统文件的特权。 一个例子是passwd程序,它需要更改/etc/passwd文件。 2.17.1 Modifying Permissions 修改权限 To change permissions, use the chmod command. First, pick the set of permissions that you want to change, and then pick the bit to ...
When making a symbolic link, check the command twice before you run it because several things can go wrong. For example, if you reverse the order of the arguments (ln -s linkname target), you’re in for some fun if linkname is a directory that already exists. If this is the case (a...
-P,--max-procs=MAX-PROCS Run up to max-procs processes at a time-p,--interactive Prompt before running commands--process-slot-var=VAR Set environment variable VAR in childprocesses -r,--no-run-if-empty If there are no arguments, run no command.If this option isnotgiven, COMMAND wil...
closefrom: File descriptors >= %d will be closed before executing a command closefrom_override: If set, users may override the value of `closefrom'withthe-C option setenv:Allowusers tosetarbitrary environment variables env_reset:Resetthe environment to adefaultsetof variables env_check:Environment...
(.text*) /* CPUDIR/start.o 中的所有.text 段 */}/* This needs to come before *(.text*) */.__efi_runtime_start : {*(.__efi_runtime_start)}.efi_runtime : {*(.text.efi_runtime*)*(.rodata.efi_runtime*)*(.data.efi_runtime*)}.__efi_runtime_stop : {*(.__efi_run...
--to-command=COMMAND 将提取的文件通过管道传送至另一个程序 1.4.5 文件属性操作选项 选项 说明 --atime-preserve[=METHOD] 在输出的文件上保留访问时间,要么通过在读取(默认METHOD=‘replace’)后还原时间,要不就不要在第一次(METHOD=‘system’)设置时间 --clamp-mtime 仅在文件比 --mtime 给出的时间更新...
You can send output through as many piped commands as you wish; just add another pipe before each additional command. 你可以通过任意多个管道命令发送输出,只需在每个附加命令之前添加另一个管道符号。 2.14.1 Standard Error(标准错误) Occasionally, you may redirect standard output but find that the pr...
If you are running Windows, use a Linux environment like Cygwin as your command line tool for interacting with Cumulus Linux. Get Started Cumulus Linux is installed on the switch by default. To upgrade to a different Cumulus Linux release or re-install Cumulus Linux, refer to Installation ...
If you submit jobs in a Yarn cluster, you must run the export HADOOP_CONF_DIR=$SPARK_HOME/conf command to add the SPARK_HOME environment variable. If you perform debugging in local mode, you must create a file named odps.conf in the $SPARK_HOME/conf path and add the following configu...
把cross-2.95.2.tar.bz2, cross-3.4.4.tar.gz 拷贝到/usr/local/arm目录中。解压这两个包。 [root@localhost ~]tar -xjvf cross-2.95.2.tar.bz2 [root@localhost ~]tar -xzvf cross-3.4.4.tar.gz 2.2.2 u-boot移植工作目录 1. 添加工作用户 ...