command tee tr

 
 shell  command  tee
 
 tee - read from standard input and write to standard output and files
 
SYNOPSIS
       tee [OPTION]... [FILE]...
 
DESCRIPTION
       Copy standard input to each FILE, and also to standard output.

      
       [root@hujunlinux vnet]# echo oeoa |tee one.txt
oeoa
[root@hujunlinux vnet]# cat one.txt
oeoa

the following  file  can see make output ,and at the same time write into
the  mk.log file.

  #!/bin/sh

make 2>&1 | tee mk.log

名称：tr
### 1.比方说要把目录下所有的大写档名换为小写档名?
似乎有很多方式，"tr"是其中一种:
#!/bin/sh
dir="/tmp/testdir";
files=`find $dir -type f`;
for i in $files
do
dir_name=`dirname $i`;
ori_filename=`basename $i`
new_filename=`echo $ori_filename | tr [:upper:] [:lower:]` > /dev/null;
#echo $new_filename;
mv $dir_name/$ori_filename $dir_name/$new_filename
done
### 2.自己试验中...lowercase to uppercase
tr abcdef...[del] ABCDE...[del]
tr a-z A-Z
tr '[:lower:]' '[:upper:]'
shell>> echo "this is a test" | tr a-z A-Z > www
shell>> cat www
THIS IS A TEST
### 3.去掉不想要的字串
shell>> tr -d this ### 去掉有关 t.e.s.t
this
man
man
test
e
### 4.取代字串
shell>> tr -s "this" "TEST"
this
TEST
th
TE

#!/bin/sh dir="/tmp/testdir"; files=`find $dir -type f`; for i in $files do         dir_name=`dirname $i`;         ori_filename=`basename $i`         new_filename=`echo $ori_filename | tr [:upper:] [:lower:]` > /dev/null;         #echo $new_filename;         mv $dir_name/$ori_filename $dir_name/$new_filename done