\u6570\u503c\u7528\u5b57\u6bcd\u547d\u4ee4\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u7528\u6570\u5b66\u7b26\u53f7<\/p>\n\n\n\n
\u6574\u6570\u6bd4\u8f83<\/p>\n\n\n\n
-eq \u7b49\u4e8e,\u5982:if [ “$a” -eq “$b” ]<\/p>\n\n\n\n\n\n\n\n
-ne \u4e0d\u7b49\u4e8e,\u5982:if [ “$a” -ne “$b” ]<\/p>\n\n\n\n
-gt \u5927\u4e8e,\u5982:if [ “$a” -gt “$b” ]<\/p>\n\n\n\n
-ge \u5927\u4e8e\u7b49\u4e8e,\u5982:if [ “$a” -ge “$b” ]<\/p>\n\n\n\n
-lt \u5c0f\u4e8e,\u5982:if [ “$a” -lt “$b” ]<\/p>\n\n\n\n
-le \u5c0f\u4e8e\u7b49\u4e8e,\u5982:if [ “$a” -le “$b” ]<\/p>\n\n\n\n
< \u5c0f\u4e8e(\u9700\u8981\u53cc\u62ec\u53f7),\u5982:((“$a” < “$b”))<\/p>\n\n\n\n
<= \u5c0f\u4e8e\u7b49\u4e8e(\u9700\u8981\u53cc\u62ec\u53f7),\u5982:((“$a” <= “$b”))<\/p>\n\n\n\n
> \u5927\u4e8e(\u9700\u8981\u53cc\u62ec\u53f7),\u5982:((“$a” > “$b”))<\/p>\n\n\n\n
>= \u5927\u4e8e\u7b49\u4e8e(\u9700\u8981\u53cc\u62ec\u53f7),\u5982:((“$a” >= “$b”))<\/p>\n\n\n\n
\u5b57\u7b26\u4e32\u6bd4\u8f83<\/p>\n\n\n\n
= \u7b49\u4e8e,\u5982:if [ “$a” = “$b” ]<\/p>\n\n\n\n
== \u7b49\u4e8e,\u5982:if [ “$a” == “$b” ],\u4e0e=\u7b49\u4ef7<\/p>\n\n\n\n
\u6ce8\u610f: [[]]\u548c[]\u4e2d\u7684\u884c\u4e3a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u4e0d\u540c\u7684:<\/p>\n\n\n\n
[[ $a == z* ]] # \u5982\u679c$a \u4ee5”z”\u5f00\u5934(\u6a21\u5f0f\u5339\u914d)\u90a3\u4e48\u5c06\u4e3atrue<\/p>\n\n\n\n
[[ $a == “z*” ]] # \u5982\u679c$a \u7b49\u4e8ez* (\u5b57\u7b26\u5339\u914d),\u90a3\u4e48\u7ed3\u679c\u4e3atrue<\/p>\n\n\n\n
[ $a == z* ] # File globbing \u548cword splitting \u5c06\u4f1a\u53d1\u751f<\/p>\n\n\n\n
[ “$a” == “z*” ] # \u5982\u679c$a \u7b49\u4e8ez* (\u5b57\u7b26\u5339\u914d),\u90a3\u4e48\u7ed3\u679c\u4e3atrue<\/p>\n\n\n\n
File globbing \u662f\u4e00\u79cd\u5173\u4e8e\u6587\u4ef6\u7684\u901f\u8bb0\u6cd5,\u6bd4\u5982”*.c”\u5c31\u662f,\u518d\u5982~\u4e5f\u662f.<\/p>\n\n\n\n
\u4f46\u662ffile globbing \u5e76\u4e0d\u662f\u4e25\u683c\u7684\u6b63\u5219\u8868\u8fbe\u5f0f,\u867d\u7136\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7ed3\u6784\u6bd4\u8f83\u50cf.<\/p>\n\n\n\n
(\u7b14\u8005\u4e0d\u592a\u61c2, \u5047\u5982\u5728\/tmp\u76ee\u5f55\u4e0b\u6709\u4e00\u4e2aa.txt\u6587\u4ef6\uff0c\u5219[ “a.txt” = a.* ]\u4f1a\u8fd4\u56de\u903b\u8f91\u771f,\u4f46\u5982\u679c\/tmp\u4e0b\u6709a.txt\u548ca.out\u4e24\u4e2a\u6587\u4ef6\uff0c\u5219\u8fd9\u6837\u5199Shell\u4f1a\u62a5\u9519)<\/p>\n\n\n\n
!= \u4e0d\u7b49\u4e8e,\u5982:if [ “$a” != “$b” ]<\/p>\n\n\n\n
\u6ce8\u610f\uff1a!= \u5728[[]]\u7ed3\u6784\u4e2d\u4f7f\u7528\u6a21\u5f0f\u5339\u914d.<\/p>\n\n\n\n
< \u5c0f\u4e8e,\u5728ASCII \u5b57\u6bcd\u987a\u5e8f\u4e0b.\u5982:<\/p>\n\n\n\n
if [[ “$a” < “$b” ]]<\/p>\n\n\n\n
if [ “$a” \\< “$b” ]<\/p>\n\n\n\n
\u6ce8\u610f:\u5728[]\u7ed3\u6784\u4e2d”<“\u9700\u8981\u88ab\u8f6c\u4e49.<\/p>\n\n\n\n
> \u5927\u4e8e,\u5728ASCII \u5b57\u6bcd\u987a\u5e8f\u4e0b.\u5982:<\/p>\n\n\n\n
if [[ “$a” > “$b” ]]<\/p>\n\n\n\n
if [ “$a” \\> “$b” ]<\/p>\n\n\n\n
\u6ce8\u610f:\u5728[]\u7ed3\u6784\u4e2d”>”\u9700\u8981\u88ab\u8f6c\u4e49.<\/p>\n\n\n\n
-z \u5b57\u7b26\u4e32\u4e3a\u7a7a.\u5c31\u662f\u957f\u5ea6\u4e3a0.<\/p>\n\n\n\n
-n \u5b57\u7b26\u4e32\u4e0d\u4e3a\u7a7a<\/p>\n\n\n\n
\u6ce8\u610f: \u5bf9\u4e8e\u5b57\u7b26\u4e32\u6216\u6570\u5b57\u7684\u6bd4\u8f83, \u52a0\u4e0a\u53cc\u5f15\u53f7(“”)\u662f\u6ca1\u6709\u574f\u5904\u7684, \u800c\u4e14\u80fd\u907f\u514d\u4e00\u4e9b\u4e0d\u5fc5\u8981\u7684\u9ebb\u70e6\uff08\u8bf7\u53c2\u8003\uff0c\u4f46\u6a21\u5f0f\u548c\u6b63\u5219\u8868\u8fbe\u5f0f\u4e0d\u80fd\u52a0\u53cc\u5f15\u53f7.<\/p>\n\n\n\n
\u6df7\u5408\u6bd4\u8f83<\/p>\n\n\n\n
-a \u903b\u8f91\u4e0e<\/p>\n\n\n\n
exp1 -a exp2 \u5982\u679cexp1 \u548cexp2 \u90fd\u4e3atrue \u7684\u8bdd,\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u5c06\u8fd4\u56detrue<\/p>\n\n\n\n
-o \u903b\u8f91\u6216<\/p>\n\n\n\n
exp1 -o exp2 \u5982\u679cexp1 \u548cexp2 \u4e2d\u6709\u4e00\u4e2a\u4e3atrue \u7684\u8bdd,\u90a3\u4e48\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u5c31\u8fd4\u56detrue<\/p>\n\n\n\n
\u4f46\u5728[[]]\u4f7f\u7528&&\u548c|| \u4ee3\u66ff-a \u548c-o, -o \u548c-a \u4e00\u822c\u90fd\u662f\u642d\u914dtest \u547d\u4ee4\u6216\u8005[]<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6570\u503c\u7528\u5b57\u6bcd\u547d\u4ee4\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f83\u7528\u6570\u5b66\u7b26\u53f7 \u6574\u6570\u6bd4\u8f83 -eq \u7b49\u4e8e,\u5982:if [ “$a” … <\/p>\n