2013年3月19日 星期二 中午小雪

引號

1、單引號

[root@desktop7 ~]# echo '\$a'

\$a

[root@desktop7 ~]# echo "\\\$a"

\$a

單引號：轉義單引號中的所有字符含義

賦值驗證

[root@desktop7 ~]# a=88

[root@desktop7 ~]# echo "$a"

88

[root@desktop7 ~]# echo '$a'

$a

2、反引號

[root@desktop7 ~]# echo `date`

Tue Mar 19 02:45:40 CST 2013

[root@desktop7 ~]#

反引號：引命令，取命令的結果

[root@desktop7 ~]# `date`

bash: Tue: command not found

[root@desktop7 ~]#

[root@desktop7 ~]# date +%Y?????????????????????? #年

2013

[root@desktop7 ~]# date +%y?????????????????????? #年

13

[root@desktop7 ~]# date +%m?????????????????????? #月

03

[root@desktop7 ~]# date +%h?????????????????????? #月

Mar

[root@desktop7 ~]# date +%d?????????????????????? #日

19

[root@desktop7 ~]# date +%H?????????????????????? #小時

02

[root@desktop7 ~]# date +%M?????????????????????? #分鐘

50

[root@desktop7 ~]# date +%S?????????????????????? #秒

05

[root@desktop7 ~]# date

Tue Mar 19 02:50:23 CST 2013

[root@desktop7 ~]# date +%Y-%m-%d

2013-03-19

查看/etc下所有變量

[root@desktop7 ~]# A=`ls /etc*`

[root@desktop7 ~]# echo $A

acpi adjtime aliases aliases.db alsa alternatives anacrontab anthy-conf asound.state at.deny audisp audit autofs_ldap_auth.conf auto.master auto.misc auto.net auto.smb avahi bashrc blkid bluetooth bonobo-activation cdrecord.conf conman.conf cron.d cron.daily cron.deny cron.hourly cron.monthly crontab cron.weekly csh.cshrc csh.login cups dbus-1 default depmod.d desktop-profiles dev.d dhcp6c.conf DIR_COLORS DIR_COLORS.xterm dnsmasq.conf dnsmasq.d dumpdates environment esd.conf ethertypes exports fb.modes filesystems fonts foomatic fstab gconf gcrypt gdm ghostscript gnome-vfs-2.0 gnome-vfs-mime-magic gpm-root.conf gre.d group group- grub.conf gshadow gshadow- gssapi_mech.conf gtk-2.0 hal host.conf hosts hosts.allow hosts.deny hp httpd idmapd.conf init.d initlog.conf inittab inputrc iproute2 iscsi issue issue.net jwhois.conf krb5.conf ldap.conf ld.so.cache ld.so.conf ld.so.conf.d lftp.conf libaudit.conf libuser.conf libvirt localtime login.defs logrotate.conf logrotate.d logwatch lsb-release.d lvm mail mailcap mail.rc makedev.d man.config mcelog.conf mgetty+sendfax mime.types mke2fs.conf modprobe.conf modprobe.conf~ modprobe.d motd mtab mtools.conf multipath.conf Muttrc Muttrc.local netplug netplug.d NetworkManager nscd.conf nsswitch.conf ntp ntp.conf ntp.conf.predhclient oddjob oddjobd.conf oddjobd.conf.d openldap opt pam.d pam_pkcs11 pam_smb.conf pango passwd passwd- pcmcia Pegasus pinforc pki pm ppp prelink.cache prelink.conf prelink.conf.d printcap profile profile.d protocols purple quotagrpadmins quotatab racoon rc rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rc.d rc.local rc.sysinit readahead.d reader.conf reader.conf.d redhat-lsb redhat-release request-key.conf resolv.conf resolv.conf.predhclient rhgb rhsm rmt rpc rpm rsyslog.conf rwtab rwtab.d sane.d sasl2 scim scrollkeeper.conf scsi_id.config securetty security selinux sensors.conf services sestatus.conf setuptool.d sgml shadow shadow- shells skel slrn.rc smartd.conf smrsh snmp sound ssh stunnel sudoers sysconfig sysctl.conf syslog.conf tcsd.conf termcap udev updatedb.conf vimrc virc warnquota.conf wgetrc wpa_supplicant X11 xdg xinetd.d xml yp.conf yum yum.conf yum.repos.d

對比

[root@desktop7 ~]# B=/etc/*

[root@desktop7 ~]# echo $B

/etc/acpi /etc/adjtime /etc/aliases /etc/aliases.db /etc/alsa /etc/alternatives /etc/anacrontab /etc/anthy-conf /etc/asound.state /etc/at.deny /etc/audisp /etc/audit /etc/autofs_ldap_auth.conf /etc/auto.master /etc/auto.misc /etc/auto.net /etc/auto.smb /etc/avahi /etc/bashrc /etc/blkid /etc/bluetooth /etc/bonobo-activation /etc/cdrecord.conf /etc/conman.conf /etc/cron.d /etc/cron.daily /etc/cron.deny /etc/cron.hourly /etc/cron.monthly /etc/crontab /etc/cron.weekly /etc/csh.cshrc /etc/csh.login /etc/cups /etc/dbus-1 /etc/default /etc/depmod.d /etc/desktop-profiles /etc/dev.d /etc/dhcp6c.conf /etc/DIR_COLORS /etc/DIR_COLORS.xterm /etc/dnsmasq.conf /etc/dnsmasq.d /etc/dumpdates /etc/environment /etc/esd.conf /etc/ethertypes /etc/exports /etc/fb.modes /etc/filesystems /etc/fonts /etc/foomatic /etc/fstab /etc/gconf /etc/gcrypt /etc/gdm /etc/ghostscript /etc/gnome-vfs-2.0 /etc/gnome-vfs-mime-magic /etc/gpm-root.conf /etc/gre.d /etc/group /etc/group- /etc/grub.conf /etc/gshadow /etc/gshadow- /etc/gssapi_mech.conf /etc/gtk-2.0 /etc/hal /etc/host.conf /etc/hosts /etc/hosts.allow /etc/hosts.deny /etc/hp /etc/httpd /etc/idmapd.conf /etc/init.d /etc/initlog.conf /etc/inittab /etc/inputrc /etc/iproute2 /etc/iscsi /etc/issue /etc/issue.net /etc/jwhois.conf /etc/krb5.conf /etc/ldap.conf /etc/ld.so.cache /etc/ld.so.conf /etc/ld.so.conf.d /etc/lftp.conf /etc/libaudit.conf /etc/libuser.conf /etc/libvirt /etc/localtime /etc/login.defs /etc/logrotate.conf /etc/logrotate.d /etc/logwatch /etc/lsb-release.d /etc/lvm /etc/mail /etc/mailcap /etc/mail.rc /etc/makedev.d /etc/man.config /etc/mcelog.conf /etc/mgetty+sendfax /etc/mime.types /etc/mke2fs.conf /etc/modprobe.conf /etc/modprobe.conf~ /etc/modprobe.d /etc/motd /etc/mtab /etc/mtools.conf /etc/multipath.conf /etc/Muttrc /etc/Muttrc.local /etc/netplug /etc/netplug.d /etc/NetworkManager /etc/nscd.conf /etc/nsswitch.conf /etc/ntp /etc/ntp.conf /etc/ntp.conf.predhclient /etc/oddjob /etc/oddjobd.conf /etc/oddjobd.conf.d /etc/openldap /etc/opt /etc/pam.d /etc/pam_pkcs11 /etc/pam_smb.conf /etc/pango /etc/passwd /etc/passwd- /etc/pcmcia /etc/Pegasus /etc/pinforc /etc/pki /etc/pm /etc/ppp /etc/prelink.cache /etc/prelink.conf /etc/prelink.conf.d /etc/printcap /etc/profile /etc/profile.d /etc/protocols /etc/purple /etc/quotagrpadmins /etc/quotatab /etc/racoon /etc/rc /etc/rc0.d /etc/rc1.d /etc/rc2.d /etc/rc3.d /etc/rc4.d /etc/rc5.d /etc/rc6.d /etc/rc.d /etc/rc.local /etc/rc.sysinit /etc/readahead.d /etc/reader.conf /etc/reader.conf.d /etc/redhat-lsb /etc/redhat-release /etc/request-key.conf /etc/resolv.conf /etc/resolv.conf.predhclient /etc/rhgb /etc/rhsm /etc/rmt /etc/rpc /etc/rpm /etc/rsyslog.conf /etc/rwtab /etc/rwtab.d /etc/sane.d /etc/sasl2 /etc/scim /etc/scrollkeeper.conf /etc/scsi_id.config /etc/securetty /etc/security /etc/selinux /etc/sensors.conf /etc/services /etc/sestatus.conf /etc/setuptool.d /etc/sgml /etc/shadow /etc/shadow- /etc/shells /etc/skel /etc/slrn.rc /etc/smartd.conf /etc/smrsh /etc/snmp /etc/sound /etc/ssh /etc/stunnel /etc/sudoers /etc/sysconfig /etc/sysctl.conf /etc/syslog.conf /etc/tcsd.conf /etc/termcap /etc/udev /etc/updatedb.conf /etc/vimrc /etc/virc /etc/warnquota.conf /etc/wgetrc /etc/wpa_supplicant /etc/X11 /etc/xdg /etc/xinetd.d /etc/xml /etc/yp.conf /etc/yum /etc/yum.conf /etc/yum.repos.d

[root@desktop7 ~]#

查看虛擬機安裝腳本

[root@desktop7 ~]# vim /root/Desktop/install-vserver

?40 LOOIP=$(ifconfig br0 |grep 'inet addr' |awk '{print $2}' |awk -F. '{print $4}')

?41 serverip=$((LOOIP+100))

?42 stationip=$((LOOIP+200))

轉載于:https://blog.51cto.com/fengzhao001/1158177

總結

以上是生活随笔為你收集整理的引号(反引号、$()符号)的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。