我有一个脚本,该脚本带有以下参数:
script.sh 1 3
然后我想浏览一个文本文件,并从每一行中打印出第一个和第三个单词。我根本不知道该怎么做。如果有人能帮助我,我将非常感激...
这是我目前拥有的:
counter=0
wordcounter=0
param=$(echo "$3" | tr , " ")
words(){
for word in $1; do
for col in $param; do
if [ $wordcounter -eq $col ]; then
echo $word
fi
done
done
wordcounter=$((wordcounter + 1))
}
eachline() {
newline=$(echo "$1" | tr , " ")
for word in $newline; do
if [ $counter -gt 3 ]; then
echo "$word"
fi
counter=$((counter + 1))
done
if [ $counter -gt 0 ]; then
words "$newline"
fi
counter=$((counter + 1))
}
while read line; do
eachline $line
done < company/employee.txt
答案 0 :(得分:3)
使用observableOfInserts.startWith(observableWithCurrentDbItems).subscribe(processSingleItem)
:
awk
$ awk '{print $1 " " $3}' file
:
file
输出为:
1 2 3 4 5
6 7 8 9 0
在bash脚本中:
1 3
6 8
使用此脚本,您可以传递任意数量的索引:
对于1和2:
#!/bin/bash
awk_command="{print";
for i in "$@"; do
awk_command="${awk_command} \$${i} \" \"";
done
awk_command="${awk_command}}";
awk "$awk_command" file
对于1、2和5:
$ ./script.sh 1 2
1 2
6 7