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# id.awk --- implement id in awk
#
# Requires user and group library functions
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# May 1993
# Revised February 1996
# Revised May 2014
# Revised September 2014
# output is:
# uid=12(foo) euid=34(bar) gid=3(baz) \
# egid=5(blat) groups=9(nine),2(two),1(one)
BEGIN {
uid = PROCINFO["uid"]
euid = PROCINFO["euid"]
gid = PROCINFO["gid"]
egid = PROCINFO["egid"]
printf("uid=%d", uid)
pw = getpwuid(uid)
pr_first_field(pw)
if (euid != uid) {
printf(" euid=%d", euid)
pw = getpwuid(euid)
pr_first_field(pw)
}
printf(" gid=%d", gid)
pw = getgrgid(gid)
pr_first_field(pw)
if (egid != gid) {
printf(" egid=%d", egid)
pw = getgrgid(egid)
pr_first_field(pw)
}
for (i = 1; ("group" i) in PROCINFO; i++) {
if (i == 1)
printf(" groups=")
group = PROCINFO["group" i]
printf("%d", group)
pw = getgrgid(group)
pr_first_field(pw)
if (("group" (i+1)) in PROCINFO)
printf(",")
}
print ""
}
function pr_first_field(str, a)
{
if (str != "") {
split(str, a, ":")
printf("(%s)", a[1])
}
}