replace a word with string in a file using shell
I have a file in which I have to convert the string “lock allpages” into STRING ” LOCATION ‘hdfs://LOCATION/DIRECTORY/TBL;’ ” . I tried sed but it’s throwing some error. can …
Tag: unix
selecting required sql from script using shell scripting
I have a sybase ddl file having ddl’s of many tables.. but the issue is along wth ddl there are many other things and unnecessary index creation script and comments. Is there any way to extract only …
mv: cannot move, Permission denied in WSL
I’m getting mv: cannot move, Permission denied error, but before claiming this is a dupe, please see what I’ve tried first: First of all, it has nothing to do with file or directory mode: $ mv -f ….
In Linux Shell, how to find out which commands I use most often and how often?
I want to find out which are the top 5 commands that I ran in the shell. I want to see which commands I use most often. It would be great if I can also see how often I ran these top commands. Is there …
How to find a files which names start with a certain amount of digits?
I am trying to locate files by name, ones that start with at least three digits for example. find . -type f -name [0-3]* will find files starting with numbers up to 3, but not with a string of three …
BASH comments: Difference between # (hash) -vs- : (colon) commenting
In bash GNU bash, version 4.2.46(2)-release (x86_64-redhat-linux-gnu) or any stable one, You can use # or : to comment What’s the difference between these 2 and usefulness? I noticed # comment makes …
C++ getpid() vs syscall(39)?
I read that syscall(39) returns the current process id (pid) Then why these 2 programs output 2 different numbers? int main() { long r = syscall(39); printf(“returned %ldn”, r); …
How does a Unix program know to change output if it’s being piped?
Calling something like ag (a grep alternative) results in an output that’s human readable. Results are printed with headers. Useful for humans, horrible for programs. $ ag ‘filter(‘ tests/…
Creating a symbolic in shared volume of docker and accessing it in host machine
I am creating a symbolic link in mounted volume of a host machine inside a docker. But I am unable to access it in host machine. Is it possible to do it. If yes how can I do that. I used the following …
How to connect to SQLPLUS and run SQL script within ssh unix?
I have the following bash script: #!/bin/bash set command “sqlplus -s user/password@tns” ssh -t test@192.168.94.139 $command Now, I want to run te following sql script (which is on the …