是否有办法在bash上比较这些字符串,例如:2.4.5和2.8和2.4.5.1?
当前回答
这在版本中最多为4个字段。
$ function ver { printf "%03d%03d%03d%03d" $(echo "$1" | tr '.' ' '); }
$ [ $(ver 10.9) -lt $(ver 10.10) ] && echo hello
hello
其他回答
如果你有coreutils-7 (Ubuntu Karmic,而不是Jaunty),那么你的排序命令应该有一个-V选项(版本排序),你可以使用它来进行比较:
verlte() {
[ "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
}
verlt() {
[ "$1" = "$2" ] && return 1 || verlte $1 $2
}
verlte 2.5.7 2.5.6 && echo "yes" || echo "no" # no
verlt 2.4.10 2.4.9 && echo "yes" || echo "no" # no
verlt 2.4.8 2.4.10 && echo "yes" || echo "no" # yes
verlte 2.5.6 2.5.6 && echo "yes" || echo "no" # yes
verlt 2.5.6 2.5.6 && echo "yes" || echo "no" # no
下面是一个不需要任何外部工具的纯Bash版本:
#!/bin/bash
vercomp () {
if [[ $1 == $2 ]]
then
return 0
fi
local IFS=.
local i ver1=($1) ver2=($2)
# fill empty fields in ver1 with zeros
for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
do
ver1[i]=0
done
for ((i=0; i<${#ver1[@]}; i++))
do
if [[ -z ${ver2[i]} ]]
then
# fill empty fields in ver2 with zeros
ver2[i]=0
fi
if ((10#${ver1[i]} > 10#${ver2[i]}))
then
return 1
fi
if ((10#${ver1[i]} < 10#${ver2[i]}))
then
return 2
fi
done
return 0
}
testvercomp () {
vercomp $1 $2
case $? in
0) op='=';;
1) op='>';;
2) op='<';;
esac
if [[ $op != $3 ]]
then
echo "FAIL: Expected '$3', Actual '$op', Arg1 '$1', Arg2 '$2'"
else
echo "Pass: '$1 $op $2'"
fi
}
# Run tests
# argument table format:
# testarg1 testarg2 expected_relationship
echo "The following tests should pass"
while read -r test
do
testvercomp $test
done << EOF
1 1 =
2.1 2.2 <
3.0.4.10 3.0.4.2 >
4.08 4.08.01 <
3.2.1.9.8144 3.2 >
3.2 3.2.1.9.8144 <
1.2 2.1 <
2.1 1.2 >
5.6.7 5.6.7 =
1.01.1 1.1.1 =
1.1.1 1.01.1 =
1 1.0 =
1.0 1 =
1.0.2.0 1.0.2 =
1..0 1.0 =
1.0 1..0 =
EOF
echo "The following test should fail (test the tester)"
testvercomp 1 1 '>'
运行测试:
$ . ./vercomp
The following tests should pass
Pass: '1 = 1'
Pass: '2.1 < 2.2'
Pass: '3.0.4.10 > 3.0.4.2'
Pass: '4.08 < 4.08.01'
Pass: '3.2.1.9.8144 > 3.2'
Pass: '3.2 < 3.2.1.9.8144'
Pass: '1.2 < 2.1'
Pass: '2.1 > 1.2'
Pass: '5.6.7 = 5.6.7'
Pass: '1.01.1 = 1.1.1'
Pass: '1.1.1 = 1.01.1'
Pass: '1 = 1.0'
Pass: '1.0 = 1'
Pass: '1.0.2.0 = 1.0.2'
Pass: '1..0 = 1.0'
Pass: '1.0 = 1..0'
The following test should fail (test the tester)
FAIL: Expected '>', Actual '=', Arg1 '1', Arg2 '1'
function version_compare () {
function sub_ver () {
local len=${#1}
temp=${1%%"."*} && indexOf=`echo ${1%%"."*} | echo ${#temp}`
echo -e "${1:0:indexOf}"
}
function cut_dot () {
local offset=${#1}
local length=${#2}
echo -e "${2:((++offset)):length}"
}
if [ -z "$1" ] || [ -z "$2" ]; then
echo "=" && exit 0
fi
local v1=`echo -e "${1}" | tr -d '[[:space:]]'`
local v2=`echo -e "${2}" | tr -d '[[:space:]]'`
local v1_sub=`sub_ver $v1`
local v2_sub=`sub_ver $v2`
if (( v1_sub > v2_sub )); then
echo ">"
elif (( v1_sub < v2_sub )); then
echo "<"
else
version_compare `cut_dot $v1_sub $v1` `cut_dot $v2_sub $v2`
fi
}
### Usage:
version_compare "1.2.3" "1.2.4"
# Output: <
功劳归于@Shellman
下面是另一个纯bash版本,比公认的答案要小得多。它只检查版本是否小于或等于“最小版本”,并且它将按字典顺序检查字母数字序列,这通常会给出错误的结果(举个常见的例子,“snapshot”不晚于“release”)。它将工作的主要/次要。
is_number() {
case "$BASH_VERSION" in
3.1.*)
PATTERN='\^\[0-9\]+\$'
;;
*)
PATTERN='^[0-9]+$'
;;
esac
[[ "$1" =~ $PATTERN ]]
}
min_version() {
if [[ $# != 2 ]]
then
echo "Usage: min_version current minimum"
return
fi
A="${1%%.*}"
B="${2%%.*}"
if [[ "$A" != "$1" && "$B" != "$2" && "$A" == "$B" ]]
then
min_version "${1#*.}" "${2#*.}"
else
if is_number "$A" && is_number "$B"
then
[[ "$A" -ge "$B" ]]
else
[[ ! "$A" < "$B" ]]
fi
fi
}
您可以通过版本命令行查看版本约束
$ version ">=1.0, <2.0" "1.7"
$ go version | version ">=1.9"
Bash脚本示例:
#!/bin/bash
if `version -b ">=9.0.0" "$(gcc --version)"`; then
echo "gcc version satisfies constraints >=9.0.0"
else
echo "gcc version doesn't satisfies constraints >=9.0.0"
fi