同时,可以通过read命令读取数组中的数据,并可以用来读取用户输入的密码。 Linux的read命令是用于从标准输入或者文件中读取一行内容并将其保存到一个变量中。它的使用非常灵活,可以用于交互式的输入,也可以用于从文件中读取内容。 ## 基本语法 “` read [options] [variable] “` ## 参数 –options:可以是以下选项...
read [-options] [variable] read命令用于从标准输入中读取一行,然后存储到变量中。如果没有给定变量名,则输入将存储在特殊变量REPLY中。 2. 交互式提示用户输入: read命令通常用于与用户交互,提示用户输入所需的数据。例如,可以在脚本中使用read命令来要求用户输入用户名、密码等信息。 3. 读取多个输入: read命令...
or an invalid file descriptor is supplied as the argument to -u. readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array] Read lines from a file into an array variable. A synonym for `mapfile'. readonly: readonly [-aAf] [...
我们 可以使用命令 help readarray 来查看 readarray 命令的帮助信息。 purleEndurer @ bash ~ $ help readarray readarray: readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array] Read lines from a file into an array variable. A synonym for `...
Used to compare files line by line. diff3 Compare three files line by line. dig Domain Information Groper, a DNS lookup utility. dir List the contents of a directory. dircolors Set colors for ‘ls’ by altering the LS_COLORS environment variable. dirname Display pathname after removing the la...
3. UsingreadWith awhileLoop If we want to read a file that contains a lot of data, we can useawhileloop andreadthe file line-by-line into a variable. We can then use the variable inside ourwhileloop’s scope: #!/bin/shcatpackages.txt |whilereadpkg;doecho"$pkg"done ...
{N1[,N2]}c{N3[,N4]}:FROMNAME的N1(含)至N2(含)行修改为TONAME的N3(含)至N4(含)行。 <:从FROMNAME删除的行。 >:添加到TONAME的行。 egrep 类似grep -E,参看grep。 grep 查找匹配字符串的行。 grep [-acEinrsv -A N -B N -C N --color] REGEXP {FILENAME|DIR}[ ...]|STDIN ...
<target_config> is the name of the configuration for that Jetson device and carrier board, specified by the environment variable BOARD. (See the table in Jetson Modules and Configurations <rootdev> specifies the device on which the root file system is located, as described in the topic Basic...
/var: variable data files 多变数据文件,可用tail、tailf等查看日志,split分割大日志 /var/cache: 应用程序缓存数据目录 /var/lib: 应用程序状态信息数据 /var/local:专用于为/usr/local下的应用程序存储可变数据 /var/lib/rpm:rpm数据库 /var/lock: 锁文件 /var/log: 日志目录及文件 /var/opt: 专用于为...
{ bufferedReader.close(); } return defaultValue; } /** * 修改ini...配置文件中变量的值 * @param file 配置文件的路径 * @param section 要修改的变量所在段名称 * @param variable 要修改的变量名称...;客户端版本号 version=0001 ;设备号 devNum=6405*/ String value = IniFileUtil.readCfgValue(...