# 强制退出i# insertesc# to command mode:w# save ,有:的命令叫ex command# moveh, j, k, l ctrl-f/b numberG gg# 第一个字符G last line of the file0(zero) 行首 ^ To the first non-whitespace character on the current line.$endof c
that’s juser. The second set, group permissions, are for the file’s group (somegroup in the example). Any user in that group can take advantage of these permissions. (Use the groups command to see what group you’re in, and see 7.3.5 Working with Groups for more...
bin=Binaries(二进制文件)/dev=Devices(设备)/etc=Etcetera(等等)/lib=LIBrary/proc=Processes/sbin=SuperuserBinaries(超级用户的二进制文件)/tmp=Temporary(临时)/usr=UnixSharedResources/var=Variable(变量)FIFO=FirstIn,FirstOutGRUB=GRandUnifiedBootloaderIFS=InternalFieldSeperatorsLILO=LInuxLOaderMySQL=My是最初作...
“-A setopt”:内建命令set的选项“-o”可用的参数。 “-A shopt”:内建命令shopt可接受的选项名。 “-A signal”:信号名。 “-A stopped”:暂停的作业名。 “-A user”:用户名,同选项“-u”。 “-A variable”:所有的shell变量名,同选项“-v”。 “-C command”:在子shell中执行命令,并把其结果...
If the $HISTTIMEFORMAT variable</span><spanstyle="color: #0000ff;">is</span>set<spanstyle="color: #0000ff;">and</span><spanstyle="color: #0000ff;">not</span>null, its value<spanstyle="color: #0000ff;">is</span><spanstyle="color: #000000;">used ...
COMMAND= command with all its arguments 带有所有参数的命令 See theps man pagefor more info. Difference between VSZ vs RSS memory usage VSZ - Virtual Set Size The Virtual Set Size is a memory size assigned to a process ( program ) during the initial execution. The Virtual Set Size memory ...
18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. bash默认 nounset选项是未启用的,所以尽管并没有定义变量a,在执行命令echo a=$a时没出错信息,而是显示:a= 当我们执行命令set -u , 启用nounset选项后,再次执行命令echo a=$a时,显示了出错信息:bash: a: unbound variable赞...
【Linux】《The Command Line Handbook》 读书笔记(下半部分) 前言 这篇博客介绍的命令确实比较多,并且受到平台字数影响,拆分为上下两个部分。 与其说是读书笔记,实际上更像是学学英语顺带学学Linux命令。这本书是通过每天挤一点时间边看边学边敲完成的,每天日常翻翻所以顺序和原始博客网站优点不一样。
To find all the variables containing a certain character string, use thegrep command: printenv |grep[VARIABLE_NAME] 1. Another command you can use to check environment variables isset. However, this command will also include local variables, as well as shell varia...
Environment variables are automatically imported into bash’s variable namespace, so they can be set and read with the standard syntax. Use export varname to promote a shell variable to an environment variable. Commands for environment variables that you want to set up at login time should be ...