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| [root@vm-101 ~] [root@vm-101 ~] readonly [root@vm-101 ~] bash: var1: 只读变量
[root@vm-101 ~] declare -r BASHOPTS="checkwinsize:cmdhist:expand_aliases:extquote:force_fignore:histappend:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath" declare -ir BASHPID declare -ar BASH_VERSINFO='([0]="4" [1]="2" [2]="46" [3]="2" [4]="release" [5]="x86_64-redhat-linux-gnu")' declare -ir EUID="0" declare -ir PPID="8634" declare -r SHELLOPTS="braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor" declare -ir UID="0" declare -r var1="readonly"
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