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# id.awk --- implement id in awk
#
# Requires user and group library functions and getopt
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# May 1993
# Revised February 1996
# Revised May 2014
# Revised September 2014
# Revised September 2020
# output is:
# uid=12(foo) euid=34(bar) gid=3(baz) \
# egid=5(blat) groups=9(nine),2(two),1(one)
# Options:
# -G Output all group ids as space separated numbers (ruid, euid, groups)
# -g Output only the euid as a number
# -n Output name instead of the numeric value (with -g/-G/-u)
# -r Output ruid/rguid instead of effective id
# -u Output only effective user id, as a number
function usage()
{
printf("Usage:\n" \
"\tid [user]\n" \
"\tid -G [-n] [user]\n" \
"\tid -g [-nr] [user]\n" \
"\tid -u [-nr] [user]\n") > "/dev/stderr"
exit 1
}
BEGIN {
# parse args
while ((c = getopt(ARGC, ARGV, "Ggnru")) != -1) {
if (c == "G")
groupset_only++
else if (c == "g")
egid_only++
else if (c == "n")
names_not_groups++
else if (c == "r")
real_ids_only++
else if (c == "u")
euid_only++
else
usage()
}
if (groupset_only && real_ids_only)
usage()
else if (ARGC - Optind > 1)
usage()
if (ARGC - Optind == 0) {
# gather info for current user
uid = PROCINFO["uid"]
euid = PROCINFO["euid"]
gid = PROCINFO["gid"]
egid = PROCINFO["egid"]
for (i = 1; ("group" i) in PROCINFO; i++)
groupset[i] = PROCINFO["group" i]
} else {
fill_info_for_user(ARGV[ARGC-1])
real_ids_only++
}
if (groupset_only) {
if (names_not_groups) {
for (i = 1; i in groupset; i++) {
entry = getgrgid(groupset[i])
name = get_first_field(entry)
printf("%s", name)
if ((i + 1) in groupset)
printf(" ")
}
} else {
for (i = 1; i in groupset; i++) {
printf("%u", groupset[i])
if ((i + 1) in groupset)
printf(" ")
}
}
print "" # final newline
exit 0
}
else if (egid_only) {
id = real_ids_only ? gid : egid
if (names_not_groups) {
entry = getgrgid(id)
name = get_first_field(entry)
printf("%s\n", name)
} else {
printf("%u\n", id)
}
exit 0
}
else if (euid_only) {
id = real_ids_only ? uid : euid
if (names_not_groups) {
entry = getpwuid(id)
name = get_first_field(entry)
printf("%s\n", name)
} else {
printf("%u\n", id)
}
exit 0
}
printf("uid=%d", uid)
pw = getpwuid(uid)
print_first_field(pw)
if (euid != uid && ! real_ids_only) {
printf(" euid=%d", euid)
pw = getpwuid(euid)
print_first_field(pw)
}
printf(" gid=%d", gid)
pw = getgrgid(gid)
print_first_field(pw)
if (egid != gid && ! real_ids_only) {
printf(" egid=%d", egid)
pw = getgrgid(egid)
print_first_field(pw)
}
for (i = 1; i in groupset; i++) {
if (i == 1)
printf(" groups=")
group = groupset[i]
printf("%d", group)
pw = getgrgid(group)
print_first_field(pw)
if ((i + 1) in groupset)
printf(",")
}
print ""
}
function get_first_field(str, a)
{
if (str != "") {
split(str, a, ":")
return a[1]
}
}
function print_first_field(str)
{
first = get_first_field(str)
printf("(%s)", first)
}
function fill_info_for_user(user,
pwent, fields, groupnames, grent, groups, i)
{
pwent = getpwnam(user)
if (pwent == "") {
printf("id: '%s': no such user\n", user) > "/dev/stderr"
exit 1
}
split(pwent, fields, ":")
uid = fields[3] + 0
gid = fields[4] + 0
groupnames = getgruser(user)
split(groupnames, groups, " ")
for (i = 1; i in groups; i++) {
grent = getgrnam(groups[i])
split(grent, fields, ":")
groupset[i] = fields[3] + 0
}
}
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