-bash: ${"This/is/a/test/string"#This}: bad substitution $ echo ${'This/is/a/test/string'#This} -bash: ${'This/is/a/test/string'#This}: bad substitution 可以看到,这里的四个表达式都不能直接处理字符串自身的内容。 ${parameter##word}的用法跟${parameter#word}类似,也是删除匹配的内容,...
# echo `expr "$stringZ" : '\(.[b-c]*[A-Z]..[0-9]\)'` # abcABC1 # echo `expr "$stringZ" : '\(...\)'` # abcABC1 # echo `expr match "$stringZ" '.*\([A-C][A-C][A-C][a-c]*\)'` # ABCabc # echo `expr "$stringZ" : '.*\(...\)'` # ABCabc exp...
${FOO%suffix} # Remove suffix ${FOO#prefix} # Remove prefix ${FOO%%suffix} # Remove long suffix ${FOO##prefix} # Remove long prefix STR="/path/to/foo.cpp" echo ${STR%.cpp} # /path/to/foo echo ${STR%.cpp}.o # /path/to/foo.o echo ${STR%/*} # /path/to echo $...
例如,给定: string="hello-world" prefix="hell" suffix="ld" 如何获得以下结果?...如果模式与 parameter 扩展后的值的开始部分匹配,则扩展的结果是从 parameter 扩展后的值中删除最短匹配模式(一个 # 的情况)或最长匹配模式(## 的情况)的值 ${parameter...如果模式与 parameter 扩展后的值的末尾部分匹配,...
Using "2>&1" , we redirect the standard error to standard output. The string "2>&1" indicates that any errors should be sent to the standard output, that is, the UNIX/Linux file id of 2 for standard error, and the file id of 1 for standard output. If you do not use this strin...
^string1^string2^ Quick substitution. Repeat the last command, replacingstring1withstring2.Equivalent to``!!:s/string1/string2/''(seeModifiersbelow). s/old/new/ Substitute new for the first occurrence of old in the event line. Any delimiter can be used in place of /. The final delimite...
new_string="${new_string#\"}" echo"This Modified String: $new_string" ${string%\"}: This expression is used to remove a trailing double quote from the end of a string.%in Bash parameter expansion indicates a suffix removal operation. The pattern following % is what we want to remove...
${parameter%word} ${parameter%%word} GNU Bash-4.1 Last change: 2009 December 29 33 User Commands BASH(1) Remove matching suffix pattern. The word is expanded to produce a pattern just as in pathname expansion. If the pattern matches a trailing portion of the expanded value of parameter, ...
Is there a way of getting./configurecompletion to return the entire option string, so that I can see what kind of data is required and then simply delete the descriptive text and add my own data? A. Define$COMP_CONFIGURE_HINTS. Setting this to anything will result in the behaviour you ...
If there are arguments after the string, they are assigned to the positional parameters, starting with $0. -i If the -i option is present, the shell is interactive. For more information about interactive shells, see invocation, below. -l Make bash act as if it had been invoked as a ...