Cat 什么是「；M-符号“；记录在哪里？_Cat_Non Printing Characters

Cat 什么是「；M-符号“；记录在哪里？

Cat 什么是「；M-符号“；记录在哪里？,cat,non-printing-characters,Cat,Non Printing Characters,报告说： M表示法是什么？它记录在哪里例如： $cat log -A wrote 262144 bytes from file test.x in 9.853947s (25.979 KiB/s)^M$ ^M> ^H^H ^H^H> 什么意思是^M和^H？^M表示控件-M（回车），而^H表示控件-H（退格）M-Something是Meta-Something（Meta-是Alt键在某些终端中的作用）。我也在想这一点。我检查了源代码，但是创建一个输入文件来获取映射似乎更容易我为

报告说：

M表示法是什么？它记录在哪里

例如：

$cat log -A
wrote 262144 bytes from file test.x in 9.853947s (25.979 KiB/s)^M$
^M> ^H^H  ^H^H>

什么意思是

^M

和

^H

？

^M

表示控件-M（回车），而

^H

表示控件-H（退格）

M-Something

是Meta-Something（Meta-是Alt键在某些终端中的作用）。

我也在想这一点。我检查了源代码，但是创建一个输入文件来获取映射似乎更容易

我为（my$I=0；$I<256；$I++）{print（sprintf（“%c是%d%x\n，$I，$I，$I））；}创建了一个带有Perl脚本的测试输入文件，然后通过cat-v运行它

如果你看到M-oM-；M-？文件开头是UTF-8字节顺序标记

向下滚动这些值以获得M值：

^@ is 0 0
^A is 1 1
^B is 2 2
^C is 3 3
^D is 4 4
^E is 5 5
^F is 6 6
^G is 7 7
^H is 8 8
(9 is tab)
(10 is NL)
^K is 11 b
^L is 12 c
^M is 13 d
^N is 14 e
^O is 15 f
^P is 16 10
^Q is 17 11
^R is 18 12
^S is 19 13
^T is 20 14
^U is 21 15
^V is 22 16
^W is 23 17
^X is 24 18
^Y is 25 19
^Z is 26 1a
^[ is 27 1b
^\ is 28 1c
^] is 29 1d
^^ is 30 1e
^_ is 31 1f
...printing chars removed...
^? is 127 7f
M-^@ is 128 80
M-^A is 129 81
M-^B is 130 82
M-^C is 131 83
M-^D is 132 84
M-^E is 133 85
M-^F is 134 86
M-^G is 135 87
M-^H is 136 88
M-^I is 137 89
M-^J is 138 8a
M-^K is 139 8b
M-^L is 140 8c
M-^M is 141 8d
M-^N is 142 8e
M-^O is 143 8f
M-^P is 144 90
M-^Q is 145 91
M-^R is 146 92
M-^S is 147 93
M-^T is 148 94
M-^U is 149 95
M-^V is 150 96
M-^W is 151 97
M-^X is 152 98
M-^Y is 153 99
M-^Z is 154 9a
M-^[ is 155 9b
M-^\ is 156 9c
M-^] is 157 9d
M-^^ is 158 9e
M-^_ is 159 9f
M-  is 160 a0
M-! is 161 a1
M-" is 162 a2
M-# is 163 a3
M-$ is 164 a4
M-% is 165 a5
M-& is 166 a6
M-' is 167 a7
M-( is 168 a8
M-) is 169 a9
M-* is 170 aa
M-+ is 171 ab
M-, is 172 ac
M-- is 173 ad
M-. is 174 ae
M-/ is 175 af
M-0 is 176 b0
M-1 is 177 b1
M-2 is 178 b2
M-3 is 179 b3
M-4 is 180 b4
M-5 is 181 b5
M-6 is 182 b6
M-7 is 183 b7
M-8 is 184 b8
M-9 is 185 b9
M-: is 186 ba
M-; is 187 bb
M-< is 188 bc
M-= is 189 bd
M-> is 190 be
M-? is 191 bf
M-@ is 192 c0
M-A is 193 c1
M-B is 194 c2
M-C is 195 c3
M-D is 196 c4
M-E is 197 c5
M-F is 198 c6
M-G is 199 c7
M-H is 200 c8
M-I is 201 c9
M-J is 202 ca
M-K is 203 cb
M-L is 204 cc
M-M is 205 cd
M-N is 206 ce
M-O is 207 cf
M-P is 208 d0
M-Q is 209 d1
M-R is 210 d2
M-S is 211 d3
M-T is 212 d4
M-U is 213 d5
M-V is 214 d6
M-W is 215 d7
M-X is 216 d8
M-Y is 217 d9
M-Z is 218 da
M-[ is 219 db
M-\ is 220 dc
M-] is 221 dd
M-^ is 222 de
M-_ is 223 df
M-` is 224 e0
M-a is 225 e1
M-b is 226 e2
M-c is 227 e3
M-d is 228 e4
M-e is 229 e5
M-f is 230 e6
M-g is 231 e7
M-h is 232 e8
M-i is 233 e9
M-j is 234 ea
M-k is 235 eb
M-l is 236 ec
M-m is 237 ed
M-n is 238 ee
M-o is 239 ef
M-p is 240 f0
M-q is 241 f1
M-r is 242 f2
M-s is 243 f3
M-t is 244 f4
M-u is 245 f5
M-v is 246 f6
M-w is 247 f7
M-x is 248 f8
M-y is 249 f9
M-z is 250 fa
M-{ is 251 fb
M-| is 252 fc
M-} is 253 fd
M-~ is 254 fe
M-^? is 255 ff

^@是0
^A是11
^B是2
^C是3
^D是4
^E是5
^F是6
^G是7
^H是8
（9是标签）
（10是NL）
^K是11B
^L是12摄氏度
^M是13D
^N是14e
^O是15华氏度
^P是16 10
^Q是17 11
^R是18 12
^S是19 13
^T是20 14
^U是21 15
^V是22 16
^W是23 17
^X是24 18
^Y是25 19
^Z是26 1a
^[27 1b]
^\是28摄氏度
^]是291D
^^是301E
^_是31楼
…已移除打印字符。。。
^? 是127 7f
M-^@为128 80
M-^A是12981
M-^B是130 82
M-^C是13183
M-^D是132 84
M-^E是133 85
M-^F是134 86
M-^G是135 87
M-^H是136 88
我是137 89
M-^J是138a
M-^K是139 8b
M-^L为140 8c
M-^M是141 8d
M-^N是142 8e
M-^O为143 8f
M-^P是144 90
M-^Q是145 91
M-^R是14692
M-^S是147 93
M-^T是148 94
M-^U是149 95
M-^V是15096
M-^W是151 97
M-^X是152 98
M-^Y是15399
M-^Z是154 9a
M-^[is 155 9b
M-^\是156 9c
M-^]是1579d
M是1589E
M-^是159 9f
M-是160 a0
M-！是161A1吗
M-“是162 a2
M-#是163 a3
M-$是164 a4
M-%是165 a5
M-&is 166 a6
M-'是167 a7
M-（是168 a8
M-）是169 a9
M-*为170 aa
M-+是171 ab
M-，是172交流电
是公元173年吗
M-是174 ae
M-/is 175 af
M-0是176 b0
M-1是177 b1
M-2为178 b2
M-3是179 b3
M-4是180 b4
M-5是181 b5
M-6是182 b6
M-7是183 b7
M-8是184 b8
M-9是185 b9
M-：是186BA
M-；是187 bb
公元前188年
M-=是189 bd
M->是190吗
M-？是191高炉吗
M-@是192 c0
M-A是193 c1
M-B是194 c2
M-C是195 c3
M-D是196 c4
M-E是197C5
M-F是198 c6
M-G是199C7
M-H是200 c8
M-I是201 c9
M-J是202 ca
M-K为203 cb
M-L为204 cc
M-M是205 cd
M-N是206ce
M-O是207cf
M-P为208 d0
M-Q为209 d1
M-R是210 d2
M-S是211 d3
M-T是212 d4
M-U是213 d5
M-V为214 d6
M-W是215D7
M-X是216 d8
M-Y是217D9
M-Z是218Da
M-[是219分贝
M-\是220直流电
M-]是221dd
M-^是222 de
M-u为223 df
M-`is 224 e0
M-a是225 e1
M-b是226 e2
M-c是227 e3
M-d是228E4
M-e是229E5
M-f是230 e6
M-g是231E7
M-h是232E8
M-i是233E9
M-j为234 ea
M-k是235eb
M-l是236欧共体
M-M是237ED
M-n是238ee
M-o为239 ef
M-p为240 f0
M-q是241f1
M-r是242 f2
M-s是243层
M-t是244 f4
M-u为245 f5
M-v是246F6
M-w是247楼
M-x是248 f8
M-y是249F9
M-z是250英尺
M-{是251 fb
M-|为252 fc
M-}是253fd
M-~为254 fe
M-^？是255 ff

我不确定

M-

符号，但涉及

的符号使用：

插入符号表示法是ASCII中控制字符的表示法

特别是,

有向图代表ASCII码为与字符的ASCII码相同，最高位为7位编码，反转

您可以通过查看ASCII二进制（八进制）表示来验证：

图像来源：

因为ASCII是这样一个有限的字符集（如上所示），所以很容易列出所有可以用插入符号表示的控制字符，例如

^@ is 0 0
^A is 1 1
^B is 2 2
^C is 3 3
^D is 4 4
^E is 5 5
^F is 6 6
^G is 7 7
^H is 8 8
(9 is tab)
(10 is NL)
^K is 11 b
^L is 12 c
^M is 13 d
^N is 14 e
^O is 15 f
^P is 16 10
^Q is 17 11
^R is 18 12
^S is 19 13
^T is 20 14
^U is 21 15
^V is 22 16
^W is 23 17
^X is 24 18
^Y is 25 19
^Z is 26 1a
^[ is 27 1b
^\ is 28 1c
^] is 29 1d
^^ is 30 1e
^_ is 31 1f
...printing chars removed...
^? is 127 7f
M-^@ is 128 80
M-^A is 129 81
M-^B is 130 82
M-^C is 131 83
M-^D is 132 84
M-^E is 133 85
M-^F is 134 86
M-^G is 135 87
M-^H is 136 88
M-^I is 137 89
M-^J is 138 8a
M-^K is 139 8b
M-^L is 140 8c
M-^M is 141 8d
M-^N is 142 8e
M-^O is 143 8f
M-^P is 144 90
M-^Q is 145 91
M-^R is 146 92
M-^S is 147 93
M-^T is 148 94
M-^U is 149 95
M-^V is 150 96
M-^W is 151 97
M-^X is 152 98
M-^Y is 153 99
M-^Z is 154 9a
M-^[ is 155 9b
M-^\ is 156 9c
M-^] is 157 9d
M-^^ is 158 9e
M-^_ is 159 9f
M-  is 160 a0
M-! is 161 a1
M-" is 162 a2
M-# is 163 a3
M-$ is 164 a4
M-% is 165 a5
M-& is 166 a6
M-' is 167 a7
M-( is 168 a8
M-) is 169 a9
M-* is 170 aa
M-+ is 171 ab
M-, is 172 ac
M-- is 173 ad
M-. is 174 ae
M-/ is 175 af
M-0 is 176 b0
M-1 is 177 b1
M-2 is 178 b2
M-3 is 179 b3
M-4 is 180 b4
M-5 is 181 b5
M-6 is 182 b6
M-7 is 183 b7
M-8 is 184 b8
M-9 is 185 b9
M-: is 186 ba
M-; is 187 bb
M-< is 188 bc
M-= is 189 bd
M-> is 190 be
M-? is 191 bf
M-@ is 192 c0
M-A is 193 c1
M-B is 194 c2
M-C is 195 c3
M-D is 196 c4
M-E is 197 c5
M-F is 198 c6
M-G is 199 c7
M-H is 200 c8
M-I is 201 c9
M-J is 202 ca
M-K is 203 cb
M-L is 204 cc
M-M is 205 cd
M-N is 206 ce
M-O is 207 cf
M-P is 208 d0
M-Q is 209 d1
M-R is 210 d2
M-S is 211 d3
M-T is 212 d4
M-U is 213 d5
M-V is 214 d6
M-W is 215 d7
M-X is 216 d8
M-Y is 217 d9
M-Z is 218 da
M-[ is 219 db
M-\ is 220 dc
M-] is 221 dd
M-^ is 222 de
M-_ is 223 df
M-` is 224 e0
M-a is 225 e1
M-b is 226 e2
M-c is 227 e3
M-d is 228 e4
M-e is 229 e5
M-f is 230 e6
M-g is 231 e7
M-h is 232 e8
M-i is 233 e9
M-j is 234 ea
M-k is 235 eb
M-l is 236 ec
M-m is 237 ed
M-n is 238 ee
M-o is 239 ef
M-p is 240 f0
M-q is 241 f1
M-r is 242 f2
M-s is 243 f3
M-t is 244 f4
M-u is 245 f5
M-v is 246 f6
M-w is 247 f7
M-x is 248 f8
M-y is 249 f9
M-z is 250 fa
M-{ is 251 fb
M-| is 252 fc
M-} is 253 fd
M-~ is 254 fe
M-^? is 255 ff