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# id.awk --- implement id in awk
# Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
# May 1993
# output is:
# uid=12(foo) euid=34(bar) gid=3(baz) \
# egid=5(blat) groups=9(nine),2(two),1(one)
BEGIN \
{
if ((getline < "/dev/user") < 0) {
err = "id: no /dev/user support - cannot run"
print err > "/dev/stderr"
exit 1
}
close("/dev/user")
uid = $1
euid = $2
gid = $3
egid = $4
printf("uid=%d", uid)
pw = getpwuid(uid)
if (pw != "") {
split(pw, a, ":")
printf("(%s)", a[1])
}
if (euid != uid) {
printf(" euid=%d", euid)
pw = getpwuid(euid)
if (pw != "") {
split(pw, a, ":")
printf("(%s)", a[1])
}
}
printf(" gid=%d", gid)
pw = getgrgid(gid)
if (pw != "") {
split(pw, a, ":")
printf("(%s)", a[1])
}
if (egid != gid) {
printf(" egid=%d", egid)
pw = getgrgid(egid)
if (pw != "") {
split(pw, a, ":")
printf("(%s)", a[1])
}
}
if (NF > 4) {
printf(" groups=");
for (i = 5; i <= NF; i++) {
printf("%d", $i)
pw = getgrgid($i)
if (pw != "") {
split(pw, a, ":")
printf("(%s)", a[1])
}
if (i < NF)
printf(",")
}
}
print ""
}
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