id.c ../lib/libapue.a -o uidgid
gcc -DLINUX -ansi -I/home/wl/mywork/apue.2e/include -Wall -D_GNU_SOURCE -I/home/wl/mywork/apue.2e/include -L../lib umask.c ../lib/libapue.a -o umask
gcc -DLINUX -ansi -I/home/wl/mywork/apue.2e/include -Wall -D_GNU_SOURCE -I/home/wl/mywork/apue.2e/include -L../lib unlink.c ../lib/libapue.a -o unlink
gcc -DLINUX -ansi -I/home/wl/mywork/apue.2e/include -Wall -D_GNU_SOURCE -I/home/wl/mywork/apue.2e/include -L../lib zap.c ../lib/libapue.a -o zap
root@ubuntu:/home/wl/mywork/apue.2e/file#
编译成功
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