linux shell创建临时文件

[root@aoi ~]# cat d #!/bin/bash #creating and using a temp file tempfile=`mktemp wz19.XXXXXX` exec 3>$tempfile echo "This script write to temp file $tempfile" echo "This is the first line" >&3 echo "This is the second line" >&3 echo "This is the last line" >&3 exec 3>&- echo "Done creating temp file. The contents are:" cat $tempfile rm -f $tempfile 2> /dev/null [root@aoi ~]# sh d This script write to temp file wz19.gnxX9K Done creating temp file. The contents are: This is the first line This is the second line This is the last line [root@aoi ~]# ls -al wz19* ls: cannot access wz19*: No such file or directory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mktemp -t wz.XXXXXX会将文件创建在系统临时文件夹下 [root@aoi ~]# mktemp -t wz.XXXXXX /tmp/wz.cs6mCq [root@aoi ~]# cat s #!/bin/bash tempfile=`mktemp -t tmp.XXXXXX` echo "This is a test file." > $tempfile echo "This is the second line of the test." >>$tempfile echo "The temp file is located at: $tempfile" cat $tempfile rm -f $tempfile [root@aoi ~]# sh s The temp file is located at: /tmp/tmp.xpLNt9 This is a test file. This is the second line of the test. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [root@aoi dir.BEEbII5]# cat ../a #!/bin/bash tempdir=`mktemp -d dir.XXXXXXX` cd $tempdir tempfile1=`mktemp temp.XXXXXX` tempfile2=`mktemp temp.XXXXXX` exec 7> $tempfile1 exec 8> $tempfile2 echo "Sending data to directory $tempdir" echo "This is a test line of data for $tempfile1" >&7 echo "This is a test line of data for $tempfile2" >&8 [root@aoi dir.BEEbII5]# ll total 8 -rw-------. 1 root root 44 Nov 20 08:24 temp.D3JWPR -rw-------. 1 root root 44 Nov 20 08:24 temp.n0IElP [root@aoi dir.BEEbII5]# cat temp.D3JWPR This is a test line of data for temp.D3JWPR [root@aoi dir.BEEbII5]# cat temp.n0IElP This is a test line of data for temp.n0IElP ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ tee filename 它将从STDIN 过来的数据同时发给两个目的地。一个目的地是STDOUT一个是 tee命令指定的文件名 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [root@aoi dir.BEEbII5]# date | tee wz Wed Nov 20 08:27:54 CST 2013 [root@aoi dir.BEEbII5]# cat wz Wed Nov 20 08:27:54 CST 2013 [root@aoi dir.BEEbII5]# who | tee wz root pts/1 2013-11-20 03:18 (192.168.1.100) [root@aoi dir.BEEbII5]# cat wz root pts/1 2013-11-20 03:18 (192.168.1.100) 默认情况下tee命令会在每次使用时覆盖输出文件的内容 如果想将数据追加到文件中必须用-a选项 [root@aoi dir.BEEbII5]# date | tee -a wz Wed Nov 20 08:30:05 CST 2013 [root@aoi dir.BEEbII5]# cat wz root pts/1 2013-11-20 03:18 (192.168.1.100) Wed Nov 20 08:30:05 CST 2013 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #!/bin/bash tempfile=test22file echo "This is the start of the test" | tee $tempfile echo "This is the second line of the test" | tee -a $tempfile echo "This is the end of the test" | tee -a $tempfile [root@aoi dir.BEEbII5]# sh v This is the start of the test This is the second line of the test This is the end of the test [root@aoi dir.BEEbII5]# cat test22file This is the start of the test This is the second line of the test This is the end of the test