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