This is a silly question, but.... with GNU Make:
VAR = MixedCaseText LOWER_VAR = $(VAR,lc) default: @echo $(VAR) @echo $(LOWER_VAR)
In the above example, what's the correct syntax for converting VAR's contents to lower case? The syntax shown (and everything else I've run across) result in LOWER_VAR being an empty string.
The toLowerCase method converts a string to lowercase letters. The toLowerCase() method doesn't take in any parameters. Strings in JavaScript are immutable. The toLowerCase() method converts the string specified into a new one that consists of only lowercase letters and returns that value.
To convert a string to lowercase in Bash, use tr command. tr stands for translate or transliterate. With tr command we can translate uppercase characters, if any, in the input string to lowercase characters.
'^' symbol is used to convert the first character of any string to uppercase and '^^' symbol is used to convert the whole string to the uppercase.
The lower() method converts all uppercase characters in a string into lowercase characters and returns it.
you can always spawn off tr
LOWER_VAR = `echo $(VAR) | tr A-Z a-z`
or
LOWER_VAR = $(shell echo $(VAR) | tr A-Z a-z)
The 'lc' functions you trying to call is from GNU Make Standard Library
Assuming that is installed , the proper syntax would be
LOWER_VAR = $(call lc,$(VAR))
You can do this directly in gmake, without using the GNU Make Standard Library:
lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1)))))))))))))))))))))))))) VAR = MixedCaseText LOWER_VAR = $(call lc,$(VAR)) all: @echo $(VAR) @echo $(LOWER_VAR)
It looks a little clunky, but it gets the job done.
If you do go with the $(shell) variety, please do use :=
instead of just =
, as in LOWER_VAR := $(shell echo $VAR | tr A-Z a-z)
. That way, you only invoke the shell one time, when the variable is declared, instead of every time the variable is referenced!
Hope that helps.
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