shell脚本学习每日一句（2）

5月21号 晚上8点更新

employee文件中记录了工号和姓名

employee.txt:

100 Jason Smith

200 John Doe

300 Sanjay Gupta

400 Ashok Sharma

bonus文件中记录工号和工资

bonus.txt:

100 $5,000

200 $500

300 $3,000

400 $1,250

要求把两个文件合并并输出如下

处理结果:

400 ashok sharma $1,250

100 jason smith $5,000

200 john doe $500

300 sanjay gupta $3,000

[root@fsailing1 shell]# vim employee.txt
[root@fsailing1 shell]# vim bonus.txt
[root@fsailing1 shell]# paste employee.txt bonus.txt
100 Jason Smith         100 $5,000
200 John Doe    200 $500
300 Sanjay Gupta        300 $3,000
400 Ashok Sharma        400 $1,250
[root@fsailing1 shell]# paste employee.txt bonus.txt |awk '{print $1 $2 $3 $ 5}'
100JasonSmith$5,000
200JohnDoe$500
300SanjayGupta$3,000
400AshokSharma$1,250

[root@fsailing1 shell]# paste employee.txt bonus.txt |awk '{print $1,$2,$3,$5}'
100 Jason Smith $5,000
200 John Doe $500
300 Sanjay Gupta $3,000
400 Ashok Sharma $1,250

[root@fsailing1 shell]# paste employee.txt bonus.txt |awk '{print $1 , $2 , $3 , $5}'|tr '[:lower:]' '[:upper:]'
100 JASON SMITH $5,000
200 JOHN DOE $500
300 SANJAY GUPTA $3,000
400 ASHOK SHARMA $1,250
[root@fsailing1 shell]# paste employee.txt bonus.txt |awk '{print $1 , $2 , $3 , $5}'|tr '[:upper:]' '[:lower:]'|sort -k 2
400 ashok sharma $1,250
100 jason smith $5,000
200 john doe $500
300 sanjay gupta $3,000

5月22号 下午2点

文件格式如下：

100

a 100

b -50

c -20

d -30

要求输出结果为：

100

a 100

200

b -50

150

c -20

130

d -30

100

[root@fsailing1 shell]# awk '{print $0;print $1}' test.txt
100
100
a 100
a
b -50
b
c -20
c
d -30
d
[root@fsailing1 shell]# awk 'NR==1{sum=$1;print $0}' test.txt NR表示awk读到的文件行数。
100
[root@fsailing1 shell]# awk 'NR==1{sum=$1;print $0} NR!=1{print $0;print sum+=$2}' test.txt
100
a 100
200
b -50
150
c -20
130
d -30
100

5月23号 20点

服务器基本信息：

[root@fsailing1 ~]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 37
model name      : Intel(R) Pentium(R) CPU        G6950  @ 2.80GHz
stepping        : 2
cpu MHz         : 1197.000
cache size      : 3072 KB

[root@fsailing1 ~]# uname -a
Linux fsailing1 2.6.18-274.18.1.el5PAE #1 SMP Thu Feb 9 13:25:50 EST 2012 i686 i686 i386 GNU/Linux
[root@fsailing1 ~]# cat /proc/meminfo
MemTotal:      4064112 kB
MemFree:        688688 kB
Buffers:        397144 kB
Cached:        2486648 kB
SwapCached:          0 kB
Active:        1543784 kB

[root@fsailing1 ~]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   83  Linux
/dev/sda2              26        1069     8385930   82  Linux swap / Solaris
/dev/sda3            1070        1706     5116702+  83  Linux
/dev/sda4            1707       60801   474680587+   f  W95 Ext'd (LBA)
/dev/sda5            1707        2343     5116671   83  Linux
/dev/sda6            2344        2980     5116671   83  Linux
/dev/sda7            2981       60801   464447151   83  Linux

5月25号 下午4点

查看系统的运行级别：

0 – 系统停机状态

1 – 单用户工作状态

2 – 多用户状态（没有NFS）

3 – 多用户状态（有NFS）

Redhat的默认运行级

4 – 系统未使用，留给用户，一般在系统出现故障时使用

5 – X11控制台（xdm，gdm或kdm）

6 – 系统正常关闭并重新启动

Linux最常用的运行级别是3 (linux系统启动后进入字符模式就是此运行级别)

和5(linux系统启动后进入图形模式是允许级别5)

[root@fsailing1 ~]# less /etc/inittab
# Default runlevel. The runlevels used by RHS are:
#   0 - halt (Do NOT set initdefault to this)
#   1 - Single user mode
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#   3 - Full multiuser mode
#   4 - unused
#   5 - X11
#   6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:

# System initialization.
si::sysinit:/etc/rc.d/rc.sysinit

l0:0:wait:/etc/rc.d/rc 0
l1:1:wait:/etc/rc.d/rc 1
l2:2:wait:/etc/rc.d/rc 2
l3:3:wait:/etc/rc.d/rc 3
l4:4:wait:/etc/rc.d/rc 4
l5:5:wait:/etc/rc.d/rc 5
l6:6:wait:/etc/rc.d/rc 6