bash:条件命令中出现意外标记283
我在bash shell中输入命令：bash:条件命令中出现意外标记283,bash,Bash,我在bash shell中输入命令： #!/bin/bash [[ a>2 ]];echo $? 我得到0 还有一个命令： #!/bin/bash [[ 3>2 ]];echo $? 我明白了 bash: unexpected token 283 in conditional command bash: syntax error near `3>' 为什么我会犯错误 如何在代码[[]]/code中使用2]]；echo$？不添加空格，但[[3>2]]必须添加空格，更想知道原
#!/bin/bash
[[ a>2 ]];echo $?
0#!/bin/bash
[[ 3>2 ]];echo $?
bash: unexpected token 283 in conditional command
bash: syntax error near `3>'
[[3>2]]a$a# Returns true
$ a=10; [[ "$a" -gt 1 ]]; echo "$?"
0
# Returns false
$ a=10; [[ "$a" -gt 12 ]]; echo "$?"
1
| Operator | Description | Example |
|----------|-----------------------------|----------------------------------------------------------|
| -eq | Is Equal To | if [ $1 -eq 200 ] |
| -ne | Is Not Equal To | if [ $1 -ne 1 ] |
| -gt | Is Greater Than | if [ $1 -gt 15 ] |
| -ge | Is Greater Than Or Equal To | if [ $1 -ge 10 ] |
| -lt | Is Less Than | if [ $1 -lt 5 ] |
| -le | Is Less Than Or Equal To | if [ $1 -le 0 ] |
| == | Is Equal To | if (( $1 == $2 )) [Note: Used within double parentheses] |
| != | Is Not Equal To | if (( $1 != $2 )) |
| < | Is Less Than | if (( $1 < $2 )) |
| <= | Is Less Than Or Equal To | if (( $1 <= $2 )) |
| > | Is Greater Than | if (( $1 > $2 )) |
| >= | Is Greater Than Or Equal To | if (( $1 >= $2 )) |
| Operator | Description | Example |
|----------|------------------------------------|-----------------|
| = or == | Is Equal To | if [ $1 == $2 ] |
| != | Is Not Equal To | if [ $1 != $2 ] |
| > | Is Greater Than (ASCII comparison) | if [ $1 > $2 ] |
| >= | Is Greater Than Or Equal To | if [ $1 >= $2 ] |
| < | Is Less Than | if [ $1 < $2 ] |
| <= | Is Less Than Or Equal To | if [ $1 <= $2 ] |
| -n | Is Not Null | if [ -n $1 ] |
| -z | Is Null (Zero Length String) | if [ -z $1 ] |
|运算符|说明|示例|
|----------|-----------------------------|----------------------------------------------------------|
|-等式|等于|如果[$1-等式200]|
|-ne |不等于|如果[$1-ne 1]|
|-gt|大于|如果[$1-gt 15]|
|-如果[1美元-ge 10]，则ge |大于或等于||
|-lt |小于|如果[$1-lt 5]|
|-le |小于或等于|如果[$1-le 0]|
|==|等于| if（$1==$2））[注：用在双括号内]|
| != | 不等于| if（（$1！=$2））|
|<|小于|如果（$1<$2））|
| $2 )) |
|>=|大于或等于|如果（$1>=$2））|
| Operator | Description | Example |
|----------|-----------------------------|----------------------------------------------------------|
| -eq | Is Equal To | if [ $1 -eq 200 ] |
| -ne | Is Not Equal To | if [ $1 -ne 1 ] |
| -gt | Is Greater Than | if [ $1 -gt 15 ] |
| -ge | Is Greater Than Or Equal To | if [ $1 -ge 10 ] |
| -lt | Is Less Than | if [ $1 -lt 5 ] |
| -le | Is Less Than Or Equal To | if [ $1 -le 0 ] |
| == | Is Equal To | if (( $1 == $2 )) [Note: Used within double parentheses] |
| != | Is Not Equal To | if (( $1 != $2 )) |
| < | Is Less Than | if (( $1 < $2 )) |
| <= | Is Less Than Or Equal To | if (( $1 <= $2 )) |
| > | Is Greater Than | if (( $1 > $2 )) |
| >= | Is Greater Than Or Equal To | if (( $1 >= $2 )) |
| Operator | Description | Example |
|----------|------------------------------------|-----------------|
| = or == | Is Equal To | if [ $1 == $2 ] |
| != | Is Not Equal To | if [ $1 != $2 ] |
| > | Is Greater Than (ASCII comparison) | if [ $1 > $2 ] |
| >= | Is Greater Than Or Equal To | if [ $1 >= $2 ] |
| < | Is Less Than | if [ $1 < $2 ] |
| <= | Is Less Than Or Equal To | if [ $1 <= $2 ] |
| -n | Is Not Null | if [ -n $1 ] |
| -z | Is Null (Zero Length String) | if [ -z $1 ] |
|运算符|说明|示例|
|----------|------------------------------------|-----------------|
|=或==|等于|如果[$1==$2]|
| != | 不等于| if[$1！=$2]|
|>|大于（ASCII比较）|如果[$1>$2]|
|>=|大于或等于|如果[$1>=$2]|
|<|小于|如果[$1<$2]|
|您必须添加空白。e、 g.[[3>2]]
，或者改用（（3>2））
。你期望会发生什么？我更好奇的是[[]]
如何使用
。代码[[a>2]]；echo$？[[3>2]][[a>3]][[1>3][[“1>3”][[1>3]]bash