以下是sh文件内容
******************************************** #！/bin/sh FILENAME=\"$1\"
cat $FILENAME | while read LINE do echo \"$LINE\" done
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给你写了一个小例子，从一个文件读数据，设置环境变量：数据文件data.txt包含三行：aaa bbb ccc ------ test.sh ------
while read data； do if [ $data = \"ccc \" ]； then echo \"[$data] \" export TTT= \"$data \" fi done < data.txt ----------------------
运行方式：。 test.sh前面加一个点表示在当前shell进程运行，这样可以修改当前环境变量
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******************************************************************* shell读文件的十二种方法（收藏）Shell 2009-11-03 22：52：53 阅读503 评论1 字号：大中小#！/usr/bin/ksh #
# SCRIPT： 12_ways_to_parse.ksh.ksh #
#
# REV： 1.2.A #
# PURPOSE： This script shows the different ways of reading # a file line by line. Again there is not just one way # to read a file line by line and some are faster than # others and some are more intuitive than others. #
# REV LIST： #
# 03/15/2002 - Randy Michael
# Set each of the while loops up as functions and the timing # of each function to see which one is the fastest. #
####################################################################### #
# NOTE： To output the timing to a file use the following syntax： #
# 12_ways_to_parse.ksh file_to_process > output_file_name 2>&1 #
# The actaul timing data is sent to standard error， file # descriptor （2）， and the function name header is sent
# to standard output， file descriptor （1）。 #
####################################################################### #
# set -n # Uncomment to check command syntax without any execution # set -x # Uncomment to debug this script #
FILENAME=\"$1\"
TIMEFILE=\"/tmp/loopfile.out\" >$TIMEFILE
THIS_SCRIPT=$（basename $0）
###################################### function usage {
echo \"/nUSAGE： $THIS_SCRIPT file_to_process/n\" echo \"OR - To send the output to a file use： \"
echo \"/n$THIS_SCRIPT file_to_process > output_file_name 2>&1 /n\" exit 1 }
###################################### function while_read_LINE {
cat $FILENAME | while read LINE do
echo \"$LINE\" ： done }
###################################### function while_read_LINE_bottom {
while read LINE do
echo \"$LINE\" ：
done < $FILENAME }
###################################### function while_line_LINE_bottom {
while line LINE do
echo $LINE
：
done < $FILENAME }
###################################### function cat_while_LINE_line {
cat $FILENAME | while LINE=`line` do
echo \"$LINE\" ： done }
###################################### function while_line_LINE {
cat $FILENAME | while line LINE do
echo \"$LINE\" ： done }
###################################### function while_LINE_line_bottom {
while LINE=`line` do
echo \"$LINE\" ：
done < $FILENAME }
###################################### function while_LINE_line_cmdsub2 {
cat $FILENAME | while LINE=$（line） do
echo \"$LINE\" ： done }
###################################### function while_LINE_line_bottom_cmdsub2 {
while LINE=$（line） do
echo \"$LINE\" ：
done < $FILENAME }
###################################### function while_read_LINE_FD {
exec 3<&0 exec 0< $FILENAME while read LINE do
echo \"$LINE\" ： done exec 0<&3 }
###################################### function while_LINE_line_FD {
exec 3<&0 exec 0< $FILENAME while LINE=`line` do
echo \"$LINE\" ： done exec 0<&3 }
###################################### function while_LINE_line_cmdsub2_FD {
exec 3<&0 exec 0< $FILENAME while LINE=$（line） do
print \"$LINE\" ： done exec 0<&3 }
######################################
function while_line_LINE_FD {
exec 3<&0 exec 0< $FILENAME while line LINE do
echo \"$LINE\" ：
done exec 0<&3 }
###################################### ########### START OF MAIN ############ ###################################### # Test the Input
# Looking for exactly one parameter （（ $# == 1 ）） || usage
# Does the file exist as a regular file？ [[ -f $1 ]] || usage
echo \"/nStarting File Processing of each Method/n\" echo \"Method 1：\"
echo \"/nfunction while_read_LINE/n\" >> $TIMEFILE echo \"function while_read_LINE\" time while_read_LINE >> $TIMEFILE echo \"/nMethod 2：\"
echo \"/nfunction while_read_LINE_bottom/n\" >> $TIMEFILE echo \"function while_read_LINE_bottom\" time while_read_LINE_bottom >> $TIMEFILE echo \"/nMethod 3：\"
echo \"/nfunction while_line_LINE_bottom/n\" >> $TIMEFILE echo \"function while_line_LINE_bottom\" time while_line_LINE_bottom >> $TIMEFILE
echo \"/nMethod 4：\"
echo \"/nfunction cat_while_LINE_line/n\" >> $TIMEFILE echo \"function cat_while_LINE_line\" time cat_while_LINE_line >> $TIMEFILE echo \"/nMethod 5：\"
echo \"/nfunction while_line_LINE/n\" >> $TIMEFILE echo \"function while_line_LINE\" time while_line_LINE >> $TIMEFILE echo \"/nMethod 6：\"
echo \"/nfunction while_LINE_line_bottom/n\" >> $TIMEFILE echo \"function while_LINE_line_bottom\" time while_LINE_line_bottom >> $TIMEFILE echo \"/nMethod 7：\"
echo \"/nfunction while_LINE_line_cmdsub2/n\" >> $TIMEFILE echo \"function while_LINE_line_cmdsub2\" time while_LINE_line_cmdsub2 >> $TIMEFILE echo \"/nMethod 8：\"
echo \"/nfunction while_LINE_line_bottom_cmdsub2/n\" >> $TIMEFILE echo \"function while_LINE_line_bottom_cmdsub2\" time while_LINE_line_bottom_cmdsub2 >> $TIMEFILE echo \"/nMethod 9：\"
echo \"/nfunction while_read_LINE_FD/n\" >> $TIMEFILE echo \"function while_read_LINE_FD\" time while_read_LINE_FD >> $TIMEFILE
echo \"/nMethod 10：\"
echo \"/nfunction while_LINE_line_FD/n\" >> $TIMEFILE echo \"function while_LINE_line_FD\" time while_LINE_line_FD >> $TIMEFILE echo \"/nMethod 11：\"
echo \"/nfunction while_LINE_line_cmdsub2_FD/n\" >> $TIMEFILE echo \"function while_LINE_line_cmdsub2_FD\" time while_LINE_line_cmdsub2_FD >> $TIMEFILE echo \"/nMethod 12：\"
echo \"/nfunction while_line_LINE_FD/n\" >> $TIMEFILE echo \"function while_line_LINE_FD\" time while_line_LINE_FD >> $TIMEFILE
