pdf: use printf over echo

changkun · changkun · commit 529399ffcd46 · 2021-08-11T12:27:20.000+02:00
echo may introduce inconsistent behaviors over different platforms. printf is considered better than echo. See: https://unix.stackexchange.com/questions/65803/why-is-printf-better-than-echo Fixes changkun#188
diff --git a/pdf/en-us/Makefile b/pdf/en-us/Makefile
@@ -6,8 +6,8 @@ revision = $(shell git describe --always --tags)
 all: revision pdf
 
 revision:
-	@echo '% Autogenerated, do not edit' > revision.tex
-	@echo '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex
+	printf '%% Autogenerated, do not edit\n' > revision.tex
+	printf '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex
 
 pdf: markdown
 	@echo "Compiling PDF file..."
diff --git a/pdf/zh-cn/Makefile b/pdf/zh-cn/Makefile
@@ -6,8 +6,8 @@ revision = $(shell git describe --always --tags)
 all: revision pdf
 
 revision:
-	@echo '% Autogenerated, do not edit' > revision.tex
-	@echo '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex
+	printf '%% Autogenerated, do not edit\n' > revision.tex
+	printf '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex
 
 pdf: markdown
 	@echo "Compiling PDF file..."
