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seq
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===
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以指定增量从首数开始打印数字到尾数
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## 补充说明
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**seq命令** 用于产生从某个数到另外一个数之间的所有整数。
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### 语法
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```
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seq [选项]... 尾数
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seq [选项]... 首数 尾数
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seq [选项]... 首数 增量 尾数
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```
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### 选项
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```
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-f, --format=格式 使用printf 样式的浮点格式
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-s, --separator=字符串 使用指定字符串分隔数字（默认使用：\n）
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-w, --equal-width 在列前添加0 使得宽度相同
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```
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### 实例
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**-f选项：指定格式**
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```
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#seq -f"%3g" 9 11
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9
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10
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11
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```
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`%`后面指定数字的位数 默认是`%g`，`%3g`那么数字位数不足部分是空格。
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```
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#sed -f"%03g" 9 11
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#seq -f"str%03g" 9 11
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str009
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str010
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str011
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```
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这样的话数字位数不足部分是0，`%`前面制定字符串。
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**-w选项：指定输出数字同宽**
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```
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seq -w 98 101
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098
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099
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100
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101
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```
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不能和`-f`一起用，输出是同宽的。
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**-s选项：指定分隔符（默认是回车）**
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```
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seq -s" " -f"str%03g" 9 11
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str009 str010 str011
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```
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要指定`/t`做为分隔符号：
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```
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seq -s"`echo -e "/t"`" 9 11
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```
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指定`\n`作为分隔符号：
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```
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seq -s"`echo -e "\n"`" 9 11
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19293949596979899910911
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```
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得到的是个错误结果，不过一般也没有这个必要，它默认的就是回车作为分隔符。
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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