Scp & # 39 th port & # 39; 22 problem solving

Problems encountered when writing a scp push file script

Script

# cat test.shemaking binbinapacheIP = `head-1 hosts.txt | tail-1 | awk-F ""'{print $1} '`PORT= `head-1 hosts.txt | tail-1 | awk-F ""' {print $2} '`scp-P ${PORT}-r $1 ${head}: / tmp

Execution result

# sh test.sh / tmp/yum.log'ad port '22lost connection

Hosts.txt file content

# cat hosts.txt 192.168.0.103 22

Cause analysis

Enable the shell debugging option, and the execution result is as follows

# sh-x test.sh / tmp/yum.log++ awk'- F'{print $1}'+ + tail-1} + head-1 hosts.txt+ IP=192.168.0.103++ awk'- F''{print $2}'+ + tail-1} + head-1 hosts.txt+ PORT=$'22\ rly + scp-P $'22\ r'- r / tmp/yum.log 192.168.0.103:/tmpyum.log'ad port '22lost connection

I wonder why there are so many problems with PORT=$'22\ r, Baidu $'\ r'.\ r is the newline character of windows. The problem may be that I wrote the hosts.tx file from windows and uploaded it to linux; because $2 is the last field, so $2 contains\ r

Solution.

Method 1: add a space after each line of the hosts.txt file

Method 2: install dos2unix

# yum install dos2unix-y. # dos2unix hosts.txt dos2unix: converting file hosts.txt to UNIX format...

Successful execution of the script again

# sh-x test.sh / tmp/yum.log + + awk'- F'{print $1}'+ + tail-1 hosts.txt+ PORT=22+ scp + head-1 hosts.txt+ IP=192.168.0.103++ awk'- F''{print $2}'+ + tail-1 hosts.txt+ PORT=22+ scp-P 22-r / tmp/yum.log 192.168.0.103:/tmpyum.log