OSS Robot

‘-exec’ using trailing ‘\’

[root@monk ~]# tar -cvf test.tar install.log
install.log
[root@monk ~]# time find /tmp/conf-2-xp -name *.xad -exec tar –append –file=/root/test.tar {} +;
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/amd64: Permission denied
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/i386: Permission denied
find: /tmp/conf-2-xp/System Volume Information: Permission denied
tar: Removing leading `/’ from member names

real    0m15.239s
user    0m0.464s
sys     0m2.628s
[root@monk ~]# du -h test.tar
310M    test.tar
[root@monk ~]# rm -f test.tar

*delete fiel and recreate since we are appending and comparing file size after each run.

‘-exec’ using trailing ‘+’

[root@monk ~]# tar -cvf test.tar install.log
install.log
[root@monk ~]# time find /tmp/conf-2-xp -name *.xad -exec tar –append –file=/root/test.tar {} \;
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/amd64: Permission denied
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/i386: Permission denied
…
real    0m39.015s
user    0m2.739s
sys     0m21.893s
[root@monk ~]# du -h test.tar
310M    test.tar

Using xargs.

*use -print0 option to prevent whitespace issue. ‘xargs -0′ passes first argument.

[root@monk ~]# rm test.tar
rm: remove regular file `test.tar’? yes
[root@monk ~]# tar -cvf test.tar install.log
install.log
[root@monk ~]# time find /tmp/conf-2-xp -name ‘*.xad’ -print0 | xargs -0 tar –append –file=/root/test.tar;
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/amd64: Permission denied
find: /tmp/conf-2-xp/9a2f6257887d6e51f58ce2/i386: Permission denied
find: /tmp/conf-2-xp/System Volume Information: Permission denied
tar: Removing leading `/’ from member names

real    0m15.073s
user    0m0.446s
sys     0m2.774s
[root@monk ~]# du -h test.tar
310M    test.tar

Result: Using ‘+’ is two times faster than using ‘\’. -exec and xargs are about the same speed, when using ‘+’ for -exec.

Uncategorized