Note:
- Bash 3.00
How to substitute this example string 123456789, to look like 123-456-789
#!/bin/sh
# trivial example
read number;
# monotically substitute '-' into string after first three and dix digits
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3 Answers
Without the use of sed:
$ number=123456789
$ number=${number:0:3}-${number:3:3}-${number:6:3}
$ echo $number
123-456-789
answered Dec 26, 2009 at 11:36
Dennis Williamson
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phone=`echo $phone | sed 's/\(...\)\(...\)/\1-\2-/'`
2 Comments
Marcelo Cantos
$ man sed Sed is a simple text filtering program that takes input from stdin or a file and applies ed commands to it. It's short for streaming ed. The backquotes execute the contained command and substitute its output on the command-line (
man bash and search for backquote for more info on this).
Dennis Williamson
$() is preferred over backquotes and works in Bash, zsh, ksh and dash (sh), but may not in the Bourne shell and doesn't in the C shell. It is specified by POSIX. opengroup.org/onlinepubs/009695399/utilities/…one way with gawk
$ echo "123456789" |awk 'BEGIN{FS=""}{ for(i=1;i<=NF;i+=3)s=s$(i)$(i+1)$(i+2)"-";sub(/-$/,"",s);print s } '
123-456-789
$ echo "123456789abcdef" | awk 'BEGIN{FS=""}{ for(i=1;i<=NF;i+=3)s=s$(i)$(i+1)$(i+2)"-";sub(/-$/,"",s);print s } '
123-456-789-abc-def
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