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# create a test file
man tcsh | bzip2 > tcsh.bz2
wc tcsh.bz2
224 1596 56890 tcsh.bz2
# with the -f flag, xz will return the compressed file if the format is
unknown, and show no warnings
xzcat -f tcsh.bz2 | wc
224 1596 56890
# xzgrep falls back to binary search in bz2 data
/usr/bin/xzgrep -c . tcsh.bz2 ; echo $?
222
0
# without -f flag
xzcat tcsh.bz2 | grep tcsh; echo $?
xzcat: tcsh.bz2: File format not recognized
1
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