Skip to main content

SSH in unix


To access another server/machine we use ssh to authenticate and do communication.

Syntax :
>ssh user@server -P password

This will login to another machine from our local system.

Sometime we may need to fetch the content from another file in remote system , in this case we can use the below form

>ssh user@server -P password "cat /home/abc/1.txt | grep <Text to search>"

If we echo the above we can see the content from our system

Eg :

echo $(ssh user@server -P password "cat /home/abc/1.txt | grep MMDDYYYY")

This will fetch the line with the date format specified from the file.
Labels:

Comments

Post a Comment

Popular posts from this blog

UNIX : How to ignore lines with certain names

Sometimes we need to ignore multiple lines with certain words and get the list out of the file. usually it will be a log file to read . The below grep command can be used to ignore multiple words present in a text file. Lets say the file contain $ cat list.txt apple orange apple banana papaya Now we need to ignore line with orange , banana and papaya . So we can use the below grep command. $ cat list.txt | grep -Ev "orange|banana|papaya" apple apple It will ignore lines with the words in -v part of grep.
Post a Comment
Read more

UNIX : unpack and pack using tar

Tarball or tar is a utility in linux to unpack or pack the files. Lets say we have a file name hello.tar.gz which is packed and compressed. To unpack the file use the below command > tar xvzf hello.tar.gz This is unpack the compressed tarball file to the directory hello in current location. To pack a list of files to a compressed tarball file , we can follow the below steps. Let say we have the following list of files in Hello directory. > cd Hello > ls helloworld.py README.txt Move back to parent directory and give the below command. > cd .. > tar zcvf hello.tar.gz Hello This will create the compressed tar file in the current location
Post a Comment
Read more