shell-var(3)

Library Functions Manual

shell-var(3)

NAME

shell_var_is_no, shell_var_is_yes, shell_var_is_number, shell_var_trim, shell_var_unquote - functions to trim spaces in the value of the variable

SYNOPSIS

•shell_var_trim varname value

•shell_var_unquote varname value

•shell_var_is_no value

•shell_var_is_yes value

•shell_var_is_number

DESCRIPTION

shell_var_trim

Function strips whitespace from the beginning and end of a string

Example:

shell_var_trim retval "   aaa bb  aaa "; echo "[$retval]"
[aaa bb  aaa]

shell_var_unquote

Function removes quote symbol from string

Example:

for i in ""str1"" "'str2'" ""str3'"; do


    shell_var_unquote var "$i";


    echo "$var";
done

Output:

str1
str2
"str3'

shell_var_is_no

Function checks whether the variable means "no".

shell_var_is_yes

Function checks whether the variable means "yes".

shell_var_is_number

Function checks whether the variable is positive number.

Example:

shell_var_is_number '123' && echo OK || echo NOP
shell_var_is_number '420' && echo OK || echo NOP
shell_var_is_number 'a42' && echo OK || echo NOP
shell_var_is_number '2 0' && echo OK || echo NOP

Output:

OK
OK
NOP
NOP

AUTHOR

Authors and contributors of the programs included in the libshell package are listed in the COPYING file.

BUGS

Report bugs to the authors.

2022-06-06