匹配/bin/sh中的包版本字符串
匹配/bin/sh中的包版本字符串
提问于 2015-11-26 23:39:58
我试图匹配给定的字符串，并将其与/bin/sh脚本中的包版本相匹配：
if test "x$version" = "x"; then
version="latest";
info "Version parameter not defined, assuming latest";
else
info "Version parameter defined: $version";
info "Matching version to package version"
case "$version" in
[^4.0.]*)
$package_version='1.0.1'
;;
[^4.1.]*)
$package_version='1.1.1'
;;
[^4.2.]*)
$package_version='1.2.6'
;;
*)
critical "Unable to match requested version to package version"
exit 1
;;
esac
fi但是，当我运行它时，我会得到一个错误：
23:38:47 +0000 INFO: Version parameter defined: 4.0.0
23:38:47 +0000 INFO: Matching Puppet version to puppet-agent package version (See http://docs.puppetlabs.com/puppet/latest/reference/about_agent.html for more details)
23:38:47 +0000 CRIT: Unable to match requested puppet version to puppet-agent version - Check http://docs.puppetlabs.com/puppet/latest/reference/about_agent.html
23:38:47 +0000 CRIT: Please file a bug report at https://github.com/petems/puppet-install-shell/
23:38:47 +0000 CRIT:
23:38:47 +0000 CRIT: Version: 4.0.0在脚本的另一部分中，我使用了与我相同的正则表达式：，它似乎在那里工作：
if test "$version" = 'latest'; then
apt-get install -y puppet-common puppet
else
case "$version" in
[^2.7.]*)
info "2.7.* Puppet deb package tied to Facter < 2.0.0, specifying Facter 1.7.4"
apt-get install -y puppet-common=$version-1puppetlabs1 puppet=$version-1puppetlabs1 facter=1.7.4-1puppetlabs1 --force-yes
;;
*)
apt-get install -y puppet-common=$version-1puppetlabs1 puppet=$version-1puppetlabs1 --force-yes
;;
esac
fi我遗漏了什么？
脚本的完整版本如下：agent.sh
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-11-27 00:16:53
- POSIX脚本中的
case ... esac使用的是(glob-style) ，而不是正则表达式(虽然两者关系遥远，但有根本的区别)。
- To get true regex matching in a `sh` script, you'd have to use `expr` with `:`, though it's probably not needed here.
- 为了测试前缀匹配，在一个
<prefix>*分支中使用case分支总是与整个参数匹配-不需要锚定(模式不支持)。
- As an aside, what you're attempting would not even work for prefix matching as a _regex_. E.g., `[^4.0.]` is the same as `[^.04]` - i.e., a _negated_ character _class_: it matches _one_ character if it is neither `.` nor `0` nor `4`.
- 当分配给POSIX脚本中的变量时，不要使用
$。
把它们放在一起：
#/bin/sh
if [ "$version" = "" ]; then
version="latest";
info "Version parameter not defined, assuming latest"
else
info "Version parameter defined: $version";
info "Matching version to package version"
case "$version" in
4.0.*)
package_version='1.0.1'
;;
4.1.*)
package_version='1.1.1'
;;
4.2.*)
package_version='1.2.6'
;;
*)
critical "Unable to match requested version to package version"
exit 1
;;
esac
fi页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/33948484
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