SHELL下十二种读文件的方法
上一篇 / 下一篇 2009-02-09 22:33:49 / 个人分类:Shell 编程
- 文件版本: V1.0
- 开发商: 本站原创
- 文件来源: 本地
- 界面语言: 简体中文
- 授权方式: 免费
- 运行平台: Win9X/Win2000/WinXP
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以KSH为例:
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#!/usr/bin/ksh
5s6W3im~0#
b9Cy\Wgxl0# scrīpt: 12_ways_to_parse.ksh.ksh51Testing软件测试网yrV7P1{ki3LQO
#51Testing软件测试网P `r+~*V+eK&d5ed gw8c
#51Testing软件测试网v!qlw:Y4U
# REV: 1.2.A51Testing软件测试网bB6D;["yF'C
#51Testing软件测试网y,G6@q%eC
# PURPOSE: This scrīpt shows the different ways of reading51Testing软件测试网HCs:p6L3sYz6k;x5Y0s
# a file line by line. Again there is not just one way51Testing软件测试网 e ~.t$kzL^
# to read a file line by line and some are faster than
7pT W F&v*YC,S|:L0# others and some are more intuitive than others.51Testing软件测试网$KD;uq|7u_)e\
#51Testing软件测试网L:W1Bb Q*[ke
# REV LIST:
/j*?:]wS5e{ Q0#
:G^*^#f+u3L0# 03/15/2002 - Randy Michael
,}WS}&s&[G O;_0# Set each of the while loops up as functions and the timing51Testing软件测试网*T7\kL\Q)}2v*I
# of each function to see which one is the fastest.
dl:hOfZ![iR/b0#51Testing软件测试网lg%},_MJ r-x V
#######################################################################
q xx9| H1pg&P OCr0#51Testing软件测试网^2Q xKN!C5P
# NOTE: To output the timing to a file use the following syntax:51Testing软件测试网#Z4@+e3[`y7hQ
#51Testing软件测试网@,xs&G,X#u
# 12_ways_to_parse.ksh file_to_process > output_file_name 2>&151Testing软件测试网1^ _s8o i.y!M?F
#51Testing软件测试网S z:Xi ] I
# The actaul timing data is sent to standard error, file
yJqH0}f2M Y0# descrīptor (2), and the function name header is sent
U [+cd)E4l'XFM0# to standard output, file descrīptor (1).51Testing软件测试网k,?C F NL"Z-O
#
z`SX-WMY0#######################################################################
#Q y'QqG0#
o,o ktFLW~5N0# set -n # Uncomment to check command syntax without any execution51Testing软件测试网` }8jZ#ri&]
# set -x # Uncomment to debug this scrīpt
)tY)O8D||8Bc0#51Testing软件测试网xT"`c!`'|A:`
B$V$faO!B)W0FILENAME="$1"
~q#v(T#Vi|`0TIMEFILE="/tmp/loopfile.out"51Testing软件测试网5|.O$KDv{
>$TIMEFILE
4i ?'Cp?l3o&c0THIS_scrīpt=$(basename $0)
TTD` F6b051Testing软件测试网#DK(H}-bn"_ B
######################################51Testing软件测试网_c&v ZT*q-k0A
function usage51Testing软件测试网EI R+p0HHZ&}
{
#D+\;K#V lu9WG\*X0echo "\nUSAGE: $THIS_scrīpt file_to_process\n"51Testing软件测试网T!x;PM0? m
echo "OR - To send the output to a file use: "51Testing软件测试网SBL_ |uS$u
echo "\n$THIS_scrīpt file_to_process > output_file_name 2>&1 \n"
sTT S5S)@3P0exit 151Testing软件测试网a`s/~6l v Z6v
}51Testing软件测试网)Q!hF V kO
######################################
H_.\ s3\_0function while_read_LINE51Testing软件测试网h'~oOM+h
{
@"Z4I2L-|,AR4w0cat $FILENAME | while read LINE51Testing软件测试网B1r1idmc$DCg On
do
6d$\Ch:N j+a0 echo "$LINE"
eS`"F.W0 :