Linux 命令(249)—— unset 命令(builtin) 编程算法shell 文章目录 1.命令简介 2.命令格式 3.选项说明 4.返回值 5.常用示例 参考文献 1.命令简介 unset 删除指定的 Shell 变量或函数。 注意,unset 不能删除具有只读属性的 Shell 变量和环境变量。 2.命令格式 unset [-fv] [name ...] 当不指定选项时,...
$cat./wifi-scan.md | grep ESSID $ iwconfig # Linux / macOS$ ifconfig # Windows$ ipconfig# macOS$ ipconfig usage: ipconfig <command> <args>where<command> is one of waitall, getifaddr, ifcount, getoption, getiflist, getsummary, getpacket, getv6packet, getra, getdhcpduid, getdhcpi...
The ls command which is used to list files and directories on Linux does not have a command option that lists only directories (Folder). However, we can Use thels -lcommand in combination with thegrepcommand to list only directories. ls -l | grep "^d" The preceding command will list d...
Additionally, “-” may be usedinplace of a file name, anywhere that a file name is accepted, toreadfrom standard input. This includes both -f and file arguments. ENVIRONMENT GREP_OPTIONS May be used to specify default options that will be placed at the beginning of the argument list. Bac...
[ Free download:Advanced Linux commands cheat sheet. ] ls -lh The-lhflag is the same long list format command as above, however, the file size is displayed in a human-readable format. Notice the difference between the file size outputs in the previous two screens. ...
-U userlist 显示属主的用户 ID 在 userlist 列表中的进程 -g grplist 显示会话或组 ID 在 grplist 列表中的进程 -p pidlist 显示PID 在 pidlist 列表中的进程 -s sesslist 显示会话 ID 在 sesslist 列表中的进程 -t ttylist 显示终端 ID 在 ttylist 列表中的进程 -u userlist 显示有效用户 ID 在...
ubuntu@VM-8-8-tar -xf compress/list2.txt.gz ubuntu@VM-8-8-ubuntu:~$ cat compress/list2.txt.gz ¦Vdlist2.txt 综上所述个人更为建议用tar命令。 alias 别名命令可以把一些复杂指令通过别名的方式替代。比如现代大部分的Linux系统都提供了类似ll的命令替代ls -l,有的云服务器会带上颜色选项。 要...
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TheLIST HISTORYcommand only returns history information for the database partition it is issued on. To list the history on multiple partitions, you can either issue theLIST HISTORYcommand from each individual database partition, or use the db2_all prefix to run theLIST HISTORYcommand on all data...