清单6-1。isvalidip,检查有效点分四段 IP 地址的参数 isvalidip() #@ USAGE: isvalidip DOTTED-QUAD { case $1 in ## reject the following: ## empty string ## anything other than digits and dots ## anything not ending in a digit "" | *[!0-9.]* | *[!0-9]) return 1 ;; esac...
CAUTION Make sure to use different filenames, otherwise your file will be overwritten! Cryptocurrency Converts Cryptocurrency based on realtime exchange rates of the top 10 cryptos Originally written by: Jonas-Taha El Sesiy Heavy modifications by: Alex Epstein Currency Converts currency based on...
the expanded value as the name of a file to read and execute. Bash behaves as if the fol‐ lowing command were executed: if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi but the value of the PATH variable is not used to search for the filename. If bash is invoked with the n...
之后的内容 /End of tempfile 查出位置后删除 # 3、替换所有的helowin为orcl 命令 :%s/helowin/orcl/g # 4、替换所有的HELOWIN为ORCL 命令 :%s/HELOWIN/ORCL/g # 5、删掉以 -- 的行 # 6、 将CREATE CONTROLFILE REUSE DATABASE "ORCL" RESETLOGS NOARCHIVELOG 中的 REUSE 改为 SET 变为了 # CREATE CON...
Bash can be configured to be POSIX- conformant by default. OPTIONS In addition to the single-character shell options documented in the description of the set builtin command, bash inter- prets the following options when it is invoked: -c string If the -c option is present, then commands ...
Bash command that converts filenames and directories to a web friendly format. - benlinton/slugify
are to be matched literally. The special pattern characters have the following meanings: * Matches any string, including the null string. When the globstar shell option is enabled, and * is used in a pathname expansion con‐ text, two adjacent *s used as a single pattern will match all ...
user@hostname:/$ 1s -1ashR |grep 'filename.txt' Other common Bash commands include the following: date.It displays the current date. touch.It creates a new file. pwd.It displays the present working directory. echo.It prints a string of text or a variable value to the terminal. ...
Converts currency based on realtime exchange rates If you want to bypass to guided input you can pass in 3 arguments and it will run from there ex.currency [baseCurrency] [exchangeToCurrency] [amountBeingExchanged] so a valid use case would be currency USD EUR 12.35Geo Provides data for...
The null string is a valid value. Once a variable is set, it may be unset only by using the unset builtin command (see name=[value] If value is not given, the variable is assigned the null string. All values undergo tilde expansion, parameter and variable expansion, command substitution...