Re: 關於tcsh改shell variable

看板FreeBSD作者hangchen.時間21年前 (2004/09/12 21:32)推噓0(0推 0噓 0→)

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※ 引述《ben@kkcity.com.tw (我是ben)》之銘言： : ※ 引述《hangchen.bbs@binary.csie.ncu.edu.tw (hang)》之銘言： : > 在tcsh中，要對shell variables或是Env. vari. 做更改的話， : > 要怎麼做呢? : > 看過tcsh的manpage, 似乎找不到對於更改這兩種variables 的用法的詳細規範… : > 要怎麼辦呢? : setenv 嗎？不好意思，沒有把manpage看完… 在PREFERENCE下有: .... .... set set name ... set name=word ... set [-r] [-f|-l] name=(wordlist) ... (+) set name[index]=word ... set -r (+) set -r name ... (+) set -r name=word ... (+) The first form of the command prints the value of all shell variables. Variables which contain more than a single word print as a parenthesized word list. The second form sets name to the null string. The third form sets name to the single word. The fourth form sets name to the list of words in wordlist. In all cases the value is command and filename expanded. If -r is specified, the value is set read-only. If -f or -l are specified, set only unique words keeping their order. -f prefers the first occurrence of a word, and -l the last. The fifth form sets the index'th component of name to word; this component must already exist. The sixth form lists only the names of all shell variables that are read-only. The seventh form makes name read-only, whether or not it has a value. The second form sets name to the null string. The eighth form is the same as the third form, but make name read- only at the same time. These arguments can be repeated to set and/or make read-only multiple variables in a single set command. Note, however, that variable expansion happens for all arguments before any setting occurs. Note also that `=' can be adjacent to both name and word or separated from both by whitespace, but cannot be adjacent to only one or the other. See also the unset builtin command. setenv [name [value]] Without arguments, prints the names and values of all environ- ment variables. Given name, sets the environment variable name to value or, without value, to the null string. 只是不知文中所提variable expansion是所意? ... ... -- 〒作者：hangchen 來自：140.115.56.58 ◎二進位的世界【140.115.50.50‧binary.csie.ncu.edu.tw】