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author | cvpcs <root@cvpcs.org> | 2010-06-02 11:02:31 -0500 |
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committer | cvpcs <root@cvpcs.org> | 2010-06-02 11:02:31 -0500 |
commit | 772f20abb0a3a0979c440114bf3a1cff5b3cef03 (patch) | |
tree | 3384b9291d73a12542c526a8557218c7435491b0 /examples/functions/isnum.bash | |
download | external_bash-772f20abb0a3a0979c440114bf3a1cff5b3cef03.zip external_bash-772f20abb0a3a0979c440114bf3a1cff5b3cef03.tar.gz external_bash-772f20abb0a3a0979c440114bf3a1cff5b3cef03.tar.bz2 |
initial import of bash 4.1
Diffstat (limited to 'examples/functions/isnum.bash')
-rw-r--r-- | examples/functions/isnum.bash | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/examples/functions/isnum.bash b/examples/functions/isnum.bash new file mode 100644 index 0000000..b733965 --- /dev/null +++ b/examples/functions/isnum.bash @@ -0,0 +1,52 @@ +#From: jrmartin@rainey.blueneptune.com (James R. Martin) +#Newsgroups: comp.unix.shell +#Subject: Re: testing user input on numeric or character value +#Date: 26 Nov 1997 01:28:43 GMT + +# isnum returns True if its argument is a valid number, +# and False (retval=1) if it is any other string. +# The first pattern requires a digit before the decimal +# point, and the second after the decimal point. + +# BASH NOTE: make sure you have executed `shopt -s extglob' before +# trying to use this function, or it will not work + +isnum() # string +{ + case $1 in + ?([-+])+([0-9])?(.)*([0-9])?([Ee]?([-+])+([0-9])) ) + return 0;; + ?([-+])*([0-9])?(.)+([0-9])?([Ee]?([-+])+([0-9])) ) + return 0;; + *) return 1;; + esac +} + +isnum2() # string +{ + case $1 in + ?([-+])+([[:digit:]])?(.)*([[:digit:]])?([Ee]?([-+])+([[:digit:]])) ) + return 0;; + ?([-+])*([[:digit:]])?(.)+([[:digit:]])?([Ee]?([-+])+([[:digit:]])) ) + return 0;; + *) return 1;; + esac +} + +isint() # string +{ + case $1 in + ?([-+])+([0-9]) ) + return 0;; + *) return 1;; + esac +} + +isint2() # string +{ + case $1 in + ?([-+])+([[:digit:]]) ) + return 0;; + *) return 1;; + esac +} |