Sed Newbie Question Post: 302525536

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Top Forums UNIX for Dummies Questions & Answers Sed Newbie Question Post 302525536 by ctsgnb on Friday 27th of May 2011 04:29:06 AM

05-27-2011

Registered User

Code:

$ cat /usr/share/misc/ascii | sed 's/[^[:print:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
   ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~
$ cat /usr/share/misc/ascii | sed 's/[^[:alnum:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z
$ cat /usr/share/misc/ascii | sed 's/[^[:alpha:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z
$ cat /usr/share/misc/ascii | sed 's/[^[:rune:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
   ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~
$ cat /usr/share/misc/ascii | sed 's/[^[:punct:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
 ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~
$ cat /usr/share/misc/ascii | sed 's/[^[:digit:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
 0 1 2 3 4 5 6 7 8 9
$ cat /usr/share/misc/ascii | sed 's/[^[:graph:]]//g' | fold -w 1 | sort | uniq | paste -sd" " -
 ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~
$

---------- Post updated at 10:12 AM ---------- Previous update was at 10:05 AM ----------

Code:

$ for i in graph rune print alnum alpha punct digit; do echo '[[:'$i':]]' ; sed 's/[^[:'$i':]]//g' /usr/share/misc/ascii | fold -w 1 | sort | uniq | paste -sd"\0" -; done
[[:graph:]]
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
[[:rune:]]
 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
[[:print:]]
 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
[[:alnum:]]
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
[[:alpha:]]
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
[[:punct:]]
!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
[[:digit:]]
0123456789

---------- Post updated at 10:20 AM ---------- Previous update was at 10:12 AM ----------

@ Royal brahim : remove the wildcard

Code:

[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([[:alpha:]]*\):/\1./g'
12.00
[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([[:alpha:]]\):/\1./g'
12:00
[ctsgnb@shell ~]$

---------- Post updated at 10:21 AM ---------- Previous update was at 10:20 AM ----------

... or add another square bracket :

Code:

[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([[[:alpha:]]]*\):/\1./g'
12:00
[ctsgnb@shell ~]$

---------- Post updated at 10:24 AM ---------- Previous update was at 10:21 AM ----------

or just

Code:

[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([:alpha:]\):/\1./g'
12:00

All of the above was tested on a FreeBSD plateform

---------- Post updated at 10:29 AM ---------- Previous update was at 10:24 AM ----------

... interesting behaviour :

Code:

[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([:alpha:]*\):/\1./g'
12.00
[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([[:alpha:]]*\):/\1./g'
12.00
[ctsgnb@shell ~]$ echo "12:00" | sed 's/\([[[:alpha:]]]*\):/\1./g'
12:00
[ctsgnb@shell ~]$

I have no idea why it behaves like this... does anybody have a clue ?

ctsgnb

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