$ unset x $ showvar $x is not set $ x=3 $ showvar $x is not set $ export x $ showvar $x = 3 $ x= ## in bash, reassignment doesn't remove a variable from the environment $ showvar $x is set but empty 注意 showvar不是一个 bash 命令,而是一个如清单 5-1 所示的脚本,...
invoke the shellasa login shell.Options:-c,--configFILELoad specified config file-e,--exec Treat remaining argumentsasthe command to execute-h,--hold never|start|error|always Keep window open after command
node执行bash脚本: 进阶方案 shelljsconst shell = require('shelljs'); # 删除文件命令shell.rm('-rf', 'out/release');// 拷贝文件命令shell.cp('-r', 'stuff/', 'out/release'); # 切换到lib目录,并且列出目录下到.js结尾到文件,并替换文件内容(sed -i 是替换文字命令)shell.cd('lib');shell....
WARC options:--warc-file=FILENAME save request/response data to a .warc.gzfile--warc-header=STRING insert STRING into the warcinfo record--warc-max-size=NUMBER set maximum size of WARC files to NUMBER--warc-cdxwriteCDX index files--warc-dedup=FILENAMEdonot store records listedinthis CDXfi...
[-# shift] [+[+]cmd] [--] [filename]... (See the OPTIONS section for alternate option syntax with long option names.) DESCRIPTION Less is a program similar to more (1), but it has many more features. Less does not have to read the entire input file before starting, so ...
mv oldname newname : 重命名文件或移动文件 rm file: 删除文件 grep 'pattern' file: 在文件内搜索字符串比如:grep 'searchstring' file.txt cut -b colnum file: 指定欲显示的文件内容范围,并将它们输出到标准输出设备比如:输出每行第5个到第9个字符cut -b5-9 file.txt千万不要和cat命令混淆,这是两个...
# 设置别名aliasname='command [option] [argument]'# 取消指定的别名设置unaliasname# 列出设置的别名alias# 转义别名aliasrm='rm -i'\rm# 转义别名而使用原始的命令[root@localhost ~]# rm tmp.txtrm: remove regularfile`tmp.txt'? n[root@localhost ~]# \rm tmp.txt # \rm,使用 \ 对别名进行转义...
# 也不可以这样：Variable= 'Some string'# Bash 会认为 'Some string' 是一条指令，由于找不到该指令，这里再次报错。# （这个例子中 'Variable=' 这部分会被当作仅对 'Some string' 起作用的赋值。）# 使用变量：echo $Variableecho "$Variable"echo '$Variable'# 当你赋值 (assign) 、导出 (export)，...
--class CLASS Set window class name(default: mintty)-H, --help Displayhelpandexit-V, --version Print version information andexit 如果想要自定义mintty终端,在git bash命令行界面右键选择选项设置即可打开设置页面. mingw是什么 mingw是Minimalist GNU for Windows的缩写,是Microsoft Windows应用程序的极简主义...
Grab lyrics for a given song quickly from the command line. Meme A lightning fast meme generator. Movies Quick search that grabs relevant information about a movie Newton Performs numerical calculations all the way up to symbolic math parsing. Qrify Takes any string of text and turns it...