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| author | rillig <rillig@pkgsrc.org> | 2006-06-29 13:37:46 +0000 |
|---|---|---|
| committer | rillig <rillig@pkgsrc.org> | 2006-06-29 13:37:46 +0000 |
| commit | f091955572abfa40d8b70b3bcaef5447dbdc8a3e (patch) | |
| tree | 41eb031562cc0d7102558d87bc714fae8aa4f6f3 | |
| parent | f2014b3dd24a7377e478aa57ece262f9d4c4372f (diff) | |
| download | pkgsrc-f091955572abfa40d8b70b3bcaef5447dbdc8a3e.tar.gz | |
Using printf is another way to print an arbitrary string.
| -rw-r--r-- | doc/guide/files/makefile.xml | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/doc/guide/files/makefile.xml b/doc/guide/files/makefile.xml index fec7b730a4e..1bff15e5e2f 100644 --- a/doc/guide/files/makefile.xml +++ b/doc/guide/files/makefile.xml @@ -1,11 +1,4 @@ -<!-- $NetBSD: makefile.xml,v 1.20 2006/05/15 16:28:19 reed Exp $ --> - -<!-- based on: -pkgsrc/bootstrap/bmake/for.c 1.1.1.1 -pkgsrc/bootstrap/bmake/make.1 1.3 -pkgsrc/bootstrap/bmake/str.c 1.1.1.1 -pkgsrc/bootstrap/bmake/var.c 1.2 ---> +<!-- $NetBSD: makefile.xml,v 1.21 2006/06/29 13:37:46 rillig Exp $ --> <chapter id="makefile"> <?dbhtml filename="makefile.html"?> <title>Programming in <filename>Makefile</filename>s</title> @@ -173,6 +166,10 @@ pkgsrc/bootstrap/bmake/var.c 1.2 <sect2 id="passing-variable-to-shell"> <title>Passing variables to a shell command</title> + <para>Sometimes you may want to print an arbitrary string. There + are many ways to get it wrong and only few that can handle every + nastiness.</para> + <programlisting> STRING= foo bar < > * `date` $$HOME ' " EXT_LIST= string=${STRING:Q} x=second\ item @@ -183,6 +180,7 @@ pkgsrc/bootstrap/bmake/var.c 1.2 echo "${STRING:Q}" # 3 echo ${STRING:Q} # 4 echo x${STRING:Q} | sed 1s,.,, # 5 + printf "%s\\n" ${STRING:Q}"" # 6 env ${EXT_LIST} /bin/sh -c 'echo "$$string"; echo "$$x"' </programlisting> @@ -207,6 +205,10 @@ pkgsrc/bootstrap/bmake/var.c 1.2 <para>Example 5 handles even the case of a leading dash correctly.</para> + <para>Example 6 also works with every string and is the + light-weight solution, since it does not involve a pipe, which has + its own problems.</para> + <para>The <varname>EXT_LIST</varname> does not need to be quoted because the quoting has already been done when adding elements to the list.</para> |