How to detect line break and non-space character in bash case logic?
Clash Royale CLAN TAG#URR8PPP
I'm writing a bash script and using the case logic to detect if my $message has non-space character, but I also want to detect non-line-break as well. Sometimes my script has the $message variable equal to a line-break and its returning true sometimes.
How do I combine a non-space and non-line-break condition?
Like this? [! !n]
This is what I have so far:
7 case $message in
8 *[! ]*) # contains non-space
9 messagex='``` '"$message"' ```' ;;
10 *) # contains nothing or only spaces
11 messagex=
12 esac
bash shell-script
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
add a comment |
I'm writing a bash script and using the case logic to detect if my $message has non-space character, but I also want to detect non-line-break as well. Sometimes my script has the $message variable equal to a line-break and its returning true sometimes.
How do I combine a non-space and non-line-break condition?
Like this? [! !n]
This is what I have so far:
7 case $message in
8 *[! ]*) # contains non-space
9 messagex='``` '"$message"' ```' ;;
10 *) # contains nothing or only spaces
11 messagex=
12 esac
bash shell-script
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
add a comment |
I'm writing a bash script and using the case logic to detect if my $message has non-space character, but I also want to detect non-line-break as well. Sometimes my script has the $message variable equal to a line-break and its returning true sometimes.
How do I combine a non-space and non-line-break condition?
Like this? [! !n]
This is what I have so far:
7 case $message in
8 *[! ]*) # contains non-space
9 messagex='``` '"$message"' ```' ;;
10 *) # contains nothing or only spaces
11 messagex=
12 esac
bash shell-script
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
I'm writing a bash script and using the case logic to detect if my $message has non-space character, but I also want to detect non-line-break as well. Sometimes my script has the $message variable equal to a line-break and its returning true sometimes.
How do I combine a non-space and non-line-break condition?
Like this? [! !n]
This is what I have so far:
7 case $message in
8 *[! ]*) # contains non-space
9 messagex='``` '"$message"' ```' ;;
10 *) # contains nothing or only spaces
11 messagex=
12 esac
bash shell-script
bash shell-script
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
asked Mar 5 at 20:41
Patoshi パトシPatoshi パトシ
56341322
56341322
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
case $message in
(*[!'
']*) : contains characters other space and newline
esac
Or:
case $message in
(*[!"$(printf 'n ')"]*) : contains characters other space and newline
esac
Or using ksh93-style $'...' special quotes (not in sh):
case $message in
(*[!$' n']*) : contains characters other space and newline
esac
Or you could use the [:space:] POSIX character class which matches any whitespace including TAB, SPC, CR, NL...
case $message in
(*[![:space:]]*) : contains non-whitespace characters
esac
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
case $message in
(*[!'
']*) : contains characters other space and newline
esac
Or:
case $message in
(*[!"$(printf 'n ')"]*) : contains characters other space and newline
esac
Or using ksh93-style $'...' special quotes (not in sh):
case $message in
(*[!$' n']*) : contains characters other space and newline
esac
Or you could use the [:space:] POSIX character class which matches any whitespace including TAB, SPC, CR, NL...
case $message in
(*[![:space:]]*) : contains non-whitespace characters
esac
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
add a comment |
case $message in
(*[!'
']*) : contains characters other space and newline
esac
Or:
case $message in
(*[!"$(printf 'n ')"]*) : contains characters other space and newline
esac
Or using ksh93-style $'...' special quotes (not in sh):
case $message in
(*[!$' n']*) : contains characters other space and newline
esac
Or you could use the [:space:] POSIX character class which matches any whitespace including TAB, SPC, CR, NL...
case $message in
(*[![:space:]]*) : contains non-whitespace characters
esac
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
add a comment |
case $message in
(*[!'
']*) : contains characters other space and newline
esac
Or:
case $message in
(*[!"$(printf 'n ')"]*) : contains characters other space and newline
esac
Or using ksh93-style $'...' special quotes (not in sh):
case $message in
(*[!$' n']*) : contains characters other space and newline
esac
Or you could use the [:space:] POSIX character class which matches any whitespace including TAB, SPC, CR, NL...
case $message in
(*[![:space:]]*) : contains non-whitespace characters
esac
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
case $message in
(*[!'
']*) : contains characters other space and newline
esac
Or:
case $message in
(*[!"$(printf 'n ')"]*) : contains characters other space and newline
esac
Or using ksh93-style $'...' special quotes (not in sh):
case $message in
(*[!$' n']*) : contains characters other space and newline
esac
Or you could use the [:space:] POSIX character class which matches any whitespace including TAB, SPC, CR, NL...
case $message in
(*[![:space:]]*) : contains non-whitespace characters
esac
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
answered Mar 5 at 22:08
Stéphane ChazelasStéphane Chazelas
312k57592948
312k57592948
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
add a comment |
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
mine doesn't have the semi-colon. do I need that after ) :
– Patoshi パトシ
Mar 6 at 16:14
add a comment |
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