If I make changes to .bashrc, how do I reload it without logging out and back in? 1 17 You can enter the long form command: source ~/.bashrc or you can use the shorter version of the command: . ~/.bashrc
How do I know if a variable is set in Bash? For example, how do I check if the user gave the first parameter to a function? function a { # if $1 is set ? } 3 37
How would I use sed to delete all lines in a text file that contain a specific string? 20 20 To remove the line and print the output to standard out: sed ‘/pattern to match/d’ ./infile To directly modify the file – does not work with BSD sed: sed -i ‘/pattern to match/d’ ./infile Same, … Read more
I have a pretty simple script that is something like the following: #!/bin/bash VAR1=”$1″ MOREF=’sudo run command against $VAR1 | grep name | cut -c7-‘ echo $MOREF When I run this script from the command line and pass it the arguments, I am not getting any output. However, when I run the commands contained within … Read more
I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do anything. So I want to either test to see that the directory does not … Read more
I have this string stored in a variable: IN=”[email protected];[email protected]” Now I would like to split the strings by ; delimiter so that I have: ADDR1=”[email protected]” ADDR2=”[email protected]” I don’t necessarily need the ADDR1 and ADDR2 variables. If they are elements of an array that’s even better. After suggestions from the answers below, I ended up with … Read more
How can I recursively find all files in current and subfolders based on wildcard matching? 1 18 Use find for that: find . -name “foo*” find needs a starting point, and the . (dot) points to the current directory.
In a Unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command: 2>&1 So, if I want to use head on the output from g++, I can do something like this: g++ lots_of_errors 2>&1 | head so … Read more
How do I copy a folder from remote to local host using scp? I use ssh to log in to my server. Then, I would like to copy the remote folder foo to local /home/user/Desktop. How do I achieve this? 12 scp -r [email protected]:/path/to/foo /home/user/Desktop/ By not including the trailing “https://stackoverflow.com/” at the end of … Read more
I have a string in Bash: string=”My string” How can I test if it contains another string? if [ $string ?? ‘foo’ ]; then echo “It’s there!” fi Where ?? is my unknown operator. Do I use echo and grep? if echo “$string” | grep ‘foo’; then echo “It’s there!” fi That looks a bit … Read more
