Tag: shell

Bash script to transfer all files from current directory to specific directory based on name

I have these files: 100-1.jpg 100-2.jpg 200-1.jpg 200-2.jpg I want these to be transferred to specific folder based on filename 100/100-1.jpg 100/100-2.jpg 200/200-1.jpg 200/200-2.jpg How do I do this? What I have tried so far how do I know I cut the string before the dash e.g 200-1 to 200 and store in a vari…

How to “grep” in array with dot “.” precisely?

arrays grep linux shell

I’m trying to check if the user input $1 exist in an array. And here is my code: What I expect is only “aaa.bbb.ccc” or “ccc.ddd.aaa” can be found. However, in this case, like “aaa” or “ccc” can also pass the validation. Seems like the dot is not treated a…

How to get Date Month values in linux date command as integers to work on

bash linux shell

I want to convert date and month as integers. for example. if the current date as per the command “Date +%m-%d-%y” output, is this 09-11-17 Then I am storing the $cur_day will give me 11 and $cur_month will give me 09. I want to do some operations on the month as 09. like i want to print all the n…

truncate shell command output from last line matching a string until EOF

awk linux shell tail

I would like to truncate the output of a shell script and only print the part between the last line matching a string/regex and EOF. E.g when running letsencrypt certbot renew –post-hook “service apache2 reload; service nginx reload” I get something like Now what I want to have is everything…

edit the only lines which matches some word

awk linux shell

I have to search a file for lines with some specific words and edit these lines as follows. The other lines should remain the same. For example: to be modified to: Can any one please help how to use AWK to achieve this. Regards Answer awk solution: Explanation: When brz or jp matches, save last field in last,…

get all aliases in linux shell

command-line linux shell

How to list all aliases defined in a shell. Like the command below to list all files/folders in a directory I have defined some alias in ~/.bashrc i want to list all that command Answer Are you wondering if you have a UNIX alias already set for a specific command? You can find it easily by issuing this on the

Shell script to edit and add a entry in file

awk linux redhat sed shell

Could any one help me to add entry at the end of the line. This is linux os. Below is the contents of the file /boot/grub2/grub.cfg I need to add entry at the end of the line “text1” and “text2”. after edit my file should look like: Answer With sed expression:

Listing files with numeric names

bash linux shell unix

How do I list files that have only numeric names e.g I have tried ls -l [0-9]* but this seems to bring all file names that start with a digit and can have anything in their name after a digit. Answer First, turn on Bash’s extglob option: Then use this pattern: Read more about extended pattern matching i…

Shell param doesn’t pass with command

command command-line linux shell

I use the following code to execute shell command, the issue is that when I put it as parameter which I should get from user it doesn’t work but If I put it hard-coded it works. Working Not working In the not working version which I do cat to param I see the value printed OK, what could I miss

Using a compiled Python shell in Linux

bash linux python shell

Is it possible to use a “more complex” shell than just a single command shell? We have written a python shell that is a command loop, and it works fine in /etc/passwd like this: Of course the Python file has the shebang line for /usr/bin/python in it. However, we’d like to compile the Python…