当数组体量太大时，这样定义未免麻烦，在bash里面（01-Jan-2015更新，感谢@mzhboy提醒，其它的一些shell，如zsh、ash不能用这种方法。）我们也可以用一行声明的方式来定义：declare -a NAMES=('Steven' 'Peter' 'David')用declare -a来声明，后面一次性定义所有数组元素。请注意，在这里，整个数组用小括号括起来...
declare -rx COMPANY_BRANCH=”West Coast Branch” bash inner.sh printf “%s\n” “$COMPANY_BRANCH” exit 0 列表5.2 inner.sh # inner.sh # # This script is run by outer.sh. printf “This is the inner script.\n” declare -p COMPANY_BRANCH COMPANY_BRANCH=”East Coast Branch” printf “...
Bash 对空格和引号非常敏感;不给变量加引号可能会导致意外结果,特别是如果你的输入可能包含空格或特殊字符。...is a number: $VAR" else echo "Need a number " fi 然而,这种方法可能有一些不一致性,并且不如正则表达式方法那样健壮,因为 declare 可能在变量不是整数或者 29210 Linux中bash shell环境变量 可能...
我正在编写一个简单的java程序,我想用它来调用bash脚本命令。 我的java代码如下所示: try{ Process p = Runtime.getRuntime().exec("myscript.sh"); BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = null; while 浏览0提问于2012-09-19得票数 1 回...
declare -rx SCRIPT=${0##*/} # SCRIPT is the name of this script declare -rx who=”/usr/bin/who” # the who command - man 1 who declare -rx TMP=”/tmp/temp.$$” # TMP is a temporary file # Sanity Checks if test ! -x “$who” ; then ...
declare -i a #定义整数变量 a=1 # 初始化变量 while test $a -lt 3; do echo $a a=$a+1 done echo $a 1. 2. 3. 4. 5. 6. 7. 8. 选择结构: case和select (类似getopts) ct@ehbio:~$ cat select_case.sh PS3="Input the position of selected parameter (1 for exit):" ...
Now remove that function because you don't need it anymore. You can do that with theunsetcommand, like this: [student@testvm1 ~]$unset-fhw;hw bash: hw:commandnot found[student@testvm1 ~]$ The hello.sh script Create a new Bash shell script,~/bin/hello.sh, and make it executable....
Here's an example one-line command to do that: PROFILE=/dev/null bash -c 'curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash'Troubleshooting on LinuxOn Linux, after running the install script, if you get nvm: command not found or see no feedback ...
If you don’t require your script to be 100% POSIX compliant, a better alternative is to use the [[ bash builtin command which will not be impacted by word splitting or glob expansion.[me@linux ~]$ string="word1 word2" # INCORRECT: Missing quotes ...
Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for ...