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Tag: shell

Commands terminated with the same char

How can I fix the follow line: The problem is that the commands of for and -exec end with a semicolon, the for command has this statement and find statment with -exec Answer You don’t even need to use -exec echo {} since that is default action in find. You can use this for loop: There is no need to

Undersired echo truncate in sh Linux

I want to send two variables as input to another command in shell script. I have tried many methods to send the two variables but I am getting unexpected problems with echo command. the above string gives unexpected truncated output.i am getting the Variables after reading from a file.(ex : HOURS1=cat time_no…

How to achieve a mirror copy in Linux?

I want to make two directories synchronized. I know there is a robocopy /MIR command in Windows that can achieve this. Ex: When there is a file updated or deleted, the backup directory can keep synchronization. I have tried in Linux through the rsync command like this: but when I delete a file under /usr/test…

How to find random files in Linux shell

How to pick 100 files randomly from a directory by Linux shell. I read other topic, ‘shuf’ command can do this: find . -type f | shuf -n100, but our environments do not have ‘shuf’ cmd. Is there other method to do this? use bash, awk, sed or sth else? Answer This should work on your Ce…

Running shell script using .env file

I am fairly new to running scripts in UNIX/Linux. I have a .env file containing environment information and a .sh script containing folder creations etc for that environment. How would I run the script on the environment contained in the .env file or how could I point the script to the target environment? Wou…

running bash piped comand from mono linux

I am trying to run bash command with pipe using mono process start here is code snippet I am trying single commands works, however pipe commands fails to run, what am I missing here ? I tried running “ps -aux” which runs fine. However ps -aux | grep gnome command failed. I tried these scenarios sc…

Nested grep with SSH

I have a following Shell command which runs successfully: However, I have to SSH to a particular machine to run this. To avoid this, I modified it in following way which leads to the failure: What is wrong with this command? How can I fix this? Answer Embed your code in a quoted heredoc to avoid needing to mo…

Can’t use multiplication in arithmetic expression

The above is the content of calculate.sh. If I use +, -, or /, I get the correct answer, but when I use *, it reports an error： How can I resolve this problem? Answer The problem was as pointed by others the fact than the character * is interpreted by your shell, be it in your terminal or your