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Add a comment about nested command substitution
"The command below shows an example of nested command substitution using two methods: backquotes and a $() construct. It could be rewritten using the same method for both substitutions, but is shown this way to demonstrate how they can be mixed. Generally the $() method is preferred."
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@ -208,6 +208,14 @@ cd build</userinput></screen>
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header using a command that is identical to what the GCC build system does
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in normal circumstances:</para>
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<note>
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<para>The command below shows an example of nested command substitution
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using two methods: backquotes and a $() construct. It could be rewritten
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using the same method for both substitutions, but is shown this way
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to demonstrate how they can be mixed. Generally the $() method is
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preferred.</para>
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</note>
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<screen><userinput remap="install">cd ..
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cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
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`dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/install-tools/include/limits.h</userinput></screen>
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