chmod +x test.sh

1 #!/bin/bash

2  dir=`ls ./`

3  for i in $dir

4  do

5      echo $i

6  done

 1 #!/bin/bash

 2 dir=`ls ./`

 3 num=0;

 4 for i in $dir

 5 do

 6 file=$i

 7     if [ ${file##*.} = txt ];then

 8         echo $file

 9         ((num++));

10     fi

11 done

12 echo $num

head -100 a.txt > b.txt

 1 #!/bin/bash

 2 dir=`ls ./`

 3 num=0;

 4 for i in $dir

 5 do

 6 file=$i

 7     if [ ${file%%_*} = ods ];then

 8         head -3 $file > ${file%.*}_3.txt

 9         ((num++));

10     fi

11 done

12 echo $num

find . -name '*100*' -exec rm -rf {} \;　　

find . -name '*100*'|xargs rm -rf;

rm *100*;

rm -f `ls ./ | egrep -v "(1$)"`

rm -f `ls ./|egrep "(^ods)"|egrep -v "(1000.txt$)"`

sed -i "s/cat/dog/g" `grep cat -rl ./`

sed -i "s/\/kkb/\/root\/kkb/g" `grep /kkb -rl ./`

sed -i "s/$var1/$var2/g" `grep $var1 -rl ./`

rename .txt .pdf *

rename _1000.txt .txt *

find -name "*.txt" |for i in *;do mv  $i `echo $i |sed 's/\.txt//g'`;done

find -name "*.txt" |awk -F'.' '{print $1} |xargs mv {}.txt {}