RCHE7 management II-2 using regular expressions with grep

Grep

-I: Ignore case

-N: Indicates the number of rows

Find the row that contains the root

# grep root/etc/passwdroot:x:0:0: root:/root:/bin/bashoperator: x: One:0:operator:/root:/sbin/nologin

Find the line with root, need to add special characters "^"

# grep ^root/etc/passwdroot:x:0:0: Root:/root:/bin/bash

Find the line ending with "/sbin/nologin" and need to add special characters "$"

# grep/sbin/nologin$/etc/passwdbin:x:1:1: bin:/bin:/sbin/nologindaemon:x: 2:2:d aemon:/sbin:/sbin/nologinadm:x:3:4: adm:/var/adm:/ Sbin/nologin

Find the line that does not appear root

# grep-v root/etc/passwdvboxadd:x:992:1::/var/run/vboxadd:/bin/False  dhcpd:x:177:177:D HCP Server:/:/sbin/nologin

Find rows that have neither root nor nologin

# grep-v Root/etc/passwd|grep-v nologinsync:x:5:0: sync:/sbin:/bin/syncshutdown:x:6:0: shutdown:/sbin:/sbin/shutdownhalt:x:7:0: halt:/sbin:/sbin/haltyb:x: +: +: yb:/home/yb:/bin/bashvboxadd:x:992:1::/var/run/vboxadd:/bin/false# grep-e-v root\|nologin/etc/passwdsync:x:5:0: sync:/sbin:/bin/syncshutdown:x:6:0: shutdown:/sbin:/sbin/shutdownhalt:x:7:0: halt:/sbin:/sbin/haltyb:x: +: +: yb:/home/yb:/bin/bashvboxadd:x:992:1::/var/run/vboxadd:/bin/false

Examples of grep and RPM use together

Find the file network-scripts belongs to which installation package # RPM-qf/etc/sysconfig/network-scripts/initscripts-9.49. --1. el7.x86_64 Find Initscripts-9.49. --1where is the help document for the. el7.x86_64 package [[email protected] initscripts-9.49. -]# RPM-QD initscripts-9.49. --1. el7.x86_64/usr/share/doc/initscripts-9.49. -/COPYING/usr/share/doc/initscripts-9.49. -/Changes.ipv6/usr/share/doc/initscripts-9.49. -/ipv6-6to4.howto/usr/share/doc/initscripts-9.49. -/ipv6-Tunnel.howto/usr/share/doc/initscripts-9.49. -/Static-routes-IPv6/usr/share/doc/initscripts-9.49. -/Sysconfig.txt/usr/share/doc/initscripts-9.49. -/Sysvinitfiles/usr/share/man/man1/consoletype.1. GZ/usr/share/man/man1/genhostid.1. GZ/usr/share/man/man1/ipcalc.1. GZ/usr/share/man/man1/netreport.1. GZ/usr/share/man/man1/usleep.1. GZ/usr/share/man/man8/ifdown.8. GZ/usr/share/man/man8/ifup.8. GZ/usr/share/man/man8/ppp-watch.8. GZ/usr/share/man/man8/service.8. GZ/usr/share/man/man8/sushell.8. GZ/usr/share/man/man8/sys-unconfig.8. GZ/usr/share/man/man8/usernetctl.8. GZ Enter the directory where the Help document is located, view the Configure IP Document # CD/usr/share/doc/initscripts-9.49. -# grep-ri'ipaddr'*--Here's *represents all files, R is recursive, I means ignore case IPv6-6to4.howto:ipaddr=XX.YY.ZZ.WW [Globally unique IPv4 Address]ipv6-6to4.howto:address (ipaddr= above), here'193.94.160.1'. Sysconfig.txt:bother to define; outWhat"ipaddr"  is, Isysconfig.txt:IPADDRn=Sysconfig.txt:LOCAL_IP='ll be converted to ipaddr by Netconfsysconfig.txt:MY_INNER_IPADDR=local IP address of the tunnelInterfaceSysconfig.txt:PEER_OUTER_IPADDR=IP address of the remote tunnel Endpointsysconfig.txt:MY_OUTER_IPADDR=IP address of the local tunnel Endpointsysconfig.txt:PEER_INNER_IPADDR=IP address of the remote end of the tunnelInterfacesysconfig.txt:If This  isspecified, a route to peer_inner_ipaddr through the tunnel# more Sysconfig.txt

RCHE7 management II-2 using regular expressions with grep