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
### the answer is does we second argument is higher
function _ver_higher {
ver=`echo -ne "$1\n$2" |sort -Vr |head -n1`
if [ "$2" == "$1" ]; then
return 1
elif [ "$2" == "$ver" ]; then
return 0
else
return 1
fi
}
if _ver_higher $1 $2; then
echo higher
else
echo same or less
fi
它非常简单和小。
其他回答
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
对于旧版本/busybox排序。简单的形式提供了粗略的结果,往往奏效。
sort -n
这是特别有用的版本,其中包含alpha符号,如
10.c.3
10.a.4
2.b.5
ver_cmp()
{
local IFS=.
local V1=($1) V2=($2) I
for ((I=0 ; I<${#V1[*]} || I<${#V2[*]} ; I++)) ; do
[[ ${V1[$I]:-0} -lt ${V2[$I]:-0} ]] && echo -1 && return
[[ ${V1[$I]:-0} -gt ${V2[$I]:-0} ]] && echo 1 && return
done
echo 0
}
ver_eq()
{
[[ $(ver_cmp "$1" "$2") -eq 0 ]]
}
ver_lt()
{
[[ $(ver_cmp "$1" "$2") -eq -1 ]]
}
ver_gt()
{
[[ $(ver_cmp "$1" "$2") -eq 1 ]]
}
ver_le()
{
[[ ! $(ver_cmp "$1" "$2") -eq 1 ]]
}
ver_ge()
{
[[ ! $(ver_cmp "$1" "$2") -eq -1 ]]
}
测试:
( ( while read V1 V2 ; do echo $V1 $(ver_cmp $V1 $V2) $V2 ; done ) <<EOF
1.2.3 2.2.3
2.2.3 2.2.2
3.10 3.2
2.2 2.2.1
3.1 3.1.0
EOF
) | sed 's/ -1 / < / ; s/ 0 / = / ; s/ 1 / > /' | column -t
1.2.3 < 2.2.3
2.2.3 > 2.2.2
3.10 > 3.2
2.2 < 2.2.1
3.1 = 3.1.0
ver_lt 10.1.2 10.1.20 && echo 'Your version is too old'
Your version is too old
function version_compare () {
function sub_ver () {
local len=${#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
下面是对顶部答案(Dennis的)的改进,它更简洁,并使用了不同的返回值方案,以便通过单个比较轻松实现<=和>=。它还比较不是[0-9]的第一个字符之后的所有内容。]因此1.0rc1 < 1.0rc2。
# Compares two tuple-based, dot-delimited version numbers a and b (possibly
# with arbitrary string suffixes). Returns:
# 1 if a<b
# 2 if equal
# 3 if a>b
# Everything after the first character not in [0-9.] is compared
# lexicographically using ASCII ordering if the tuple-based versions are equal.
compare_versions() {
if [[ $1 == "$2" ]]; then
return 2
fi
local IFS=.
local i a=(${1%%[^0-9.]*}) b=(${2%%[^0-9.]*})
local arem=${1#${1%%[^0-9.]*}} brem=${2#${2%%[^0-9.]*}}
for ((i=0; i<${#a[@]} || i<${#b[@]}; i++)); do
if ((10#${a[i]:-0} < 10#${b[i]:-0})); then
return 1
elif ((10#${a[i]:-0} > 10#${b[i]:-0})); then
return 3
fi
done
if [ "$arem" '<' "$brem" ]; then
return 1
elif [ "$arem" '>' "$brem" ]; then
return 3
fi
return 2
}
为了解决@gammazero的评论,一个(我认为)与语义版本兼容的更长的版本是:
# Compares two dot-delimited decimal-element version numbers a and b that may
# also have arbitrary string suffixes. Compatible with semantic versioning, but
# not as strict: comparisons of non-semver strings may have unexpected
# behavior.
#
# Returns:
# 1 if a<b
# 2 if equal
# 3 if a>b
compare_versions() {
local LC_ALL=C
# Optimization
if [[ $1 == "$2" ]]; then
return 2
fi
# Compare numeric release versions. Supports an arbitrary number of numeric
# elements (i.e., not just X.Y.Z) in which unspecified indices are regarded
# as 0.
local aver=${1%%[^0-9.]*} bver=${2%%[^0-9.]*}
local arem=${1#$aver} brem=${2#$bver}
local IFS=.
local i a=($aver) b=($bver)
for ((i=0; i<${#a[@]} || i<${#b[@]}; i++)); do
if ((10#${a[i]:-0} < 10#${b[i]:-0})); then
return 1
elif ((10#${a[i]:-0} > 10#${b[i]:-0})); then
return 3
fi
done
# Remove build metadata before remaining comparison
arem=${arem%%+*}
brem=${brem%%+*}
# Prelease (w/remainder) always older than release (no remainder)
if [ -n "$arem" -a -z "$brem" ]; then
return 1
elif [ -z "$arem" -a -n "$brem" ]; then
return 3
fi
# Otherwise, split by periods and compare individual elements either
# numerically or lexicographically
local a=(${arem#-}) b=(${brem#-})
for ((i=0; i<${#a[@]} && i<${#b[@]}; i++)); do
local anns=${a[i]#${a[i]%%[^0-9]*}} bnns=${b[i]#${b[i]%%[^0-9]*}}
if [ -z "$anns$bnns" ]; then
# Both numeric
if ((10#${a[i]:-0} < 10#${b[i]:-0})); then
return 1
elif ((10#${a[i]:-0} > 10#${b[i]:-0})); then
return 3
fi
elif [ -z "$anns" ]; then
# Numeric comes before non-numeric
return 1
elif [ -z "$bnns" ]; then
# Numeric comes before non-numeric
return 3
else
# Compare lexicographically
if [[ ${a[i]} < ${b[i]} ]]; then
return 1
elif [[ ${a[i]} > ${b[i]} ]]; then
return 3
fi
fi
done
# Fewer elements is earlier
if (( ${#a[@]} < ${#b[@]} )); then
return 1
elif (( ${#a[@]} > ${#b[@]} )); then
return 3
fi
# Must be equal!
return 2
}