1.UNCOMPRESS :
uncompress the image and extract the archive into /tmp/initrd
#gzip -dc < /tmp/initrd.img | cpio -idv ----- or ---- zcat -d image|cpio -idv ---- 2COMPRESS :
a) Generate a list of files to be made into a new cpio archive.
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#find . -depth -print | cpio -ovc > ../custom-initrd.cpio
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b) gzip the cpio image:
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#gzip -9 ../custom-initrd.cpio
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tc..
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