typora/note/Shell/awk 条件判断.md

• if

[sunqi@manjaro-xfce ~]$ awk -F: '{ if($3>=500 && $3<=60000) {print $1,$3}}' /etc/passwd
systemd-coredump 981
systemd-network 980
systemd-oom 979
systemd-journal-remote 978
systemd-resolve 977
systemd-timesync 976
tss 975
dhcpcd 974
dnsmasq 973
avahi 971
colord 970
flatpak 969
geoclue 968
git 967
lightdm 966
nm-openconnect 965
nm-openvpn 964
openvpn 963
sunqi 1000
vncuser 1001
[sunqi@manjaro-xfce ~]$

• if else

[sunqi@manjaro-xfce ~]$ awk -F: '{ if($3==0) {print $1" is admin"} else {print $1" not admin"} }' /etc/passwd
root is admin
nobody not admin
dbus not admin
bin not admin
daemon not admin
mail not admin
ftp not admin
http not admin

• if else begin 结合shell 命令

[sunqi@manjaro-xfce ~]$ awk 'BEGIN{ if($(id -u) -ge 500 && $(id -u) -ne 65534) {print "是普通用户"} else {print "不是普通用户"}}'
是普通用户
[sunqi@manjaro-xfce ~]$

• if else if else