Reading the source of https://raw.github.com/Homebrew/homebrew/go/install — it only prompts if stdin is a TTY. If you redirect stdin from /dev/null, it won’t prompt at all. So: ruby \ -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” \ </dev/null
I believe the problem here is that the first grep is buffering the output which means the second grep won’t see it until the buffer is flushed. Try adding the –line-buffered option on your first grep: tail -f access_log | grep –line-buffered “127.0.0.1” | grep -v “.css” For more info, see “BashFAQ/009 — What is … Read more
You can do it using Bash’s numeric context: if (( $(echo “$result1 > $result2” | bc -l) )); then bc will output 0 or 1 and the (( )) will interpret them as false or true respectively. The same thing using AWK: if (( $(echo “$result1 $result2” | awk ‘{print ($1 > $2)}’) )); then
The awk solution is what I would use, but if you want to understand your problems with bash, here is a revised version of your script. #!/bin/bash -vx ##config file with ip addresses like 10.10.10.1:80 file=config.txt while read line ; do ##this line is not correct, should strip :port and store to ip var ip=$( … Read more
What about the shorter : #!/bin/bash [[ $1 == A ]] && echo “A” || echo “not A” ? And a beginner version (identical logic) : #!/bin/bash if [[ $1 == A ]]; then echo “A” else echo “not A” fi Like Scott said, you have a syntax error (missing space). explanations I use boolean … Read more
You can group multiple commands within { }. Saying: some_command || { command1; command2; } would execute command1 and command2 if some_command exited with a non-zero return code. {} { list; } Placing a list of commands between curly braces causes the list to be executed in the current shell context. No subshell is created. … Read more
Looks like it’s as simple as #!/bin/bash sqlite3 test.db “create table n (id INTEGER PRIMARY KEY,f TEXT,l TEXT);” sqlite3 test.db “insert into n (f,l) values (‘john’,’smith’);” sqlite3 test.db “select * from n;” from https://mailliststock.wordpress.com/2007/03/01/sqlite-examples-with-bash-perl-and-python/
Add set bell-style none to .inputrc in your home directory. You need to start a new shell for this to take effect; that may be why your test didn’t work.
Two things are going wrong here. Firstly, your first snippet is not doing what I think you think it is. Try removing the second line, the echo. It still prints the date, right? Because this: DATE= date +’20%y-%m-%d’ Is not a variable assignment – it’s an invocation of date with an auxiliary environment variable (the … Read more
You need to add yourself to the crontab group. usermod -a -G crontab (username) Once you have done this, you also need to make sure that cron is running. Usually this is started with start cron however upstart does not work on WSL from what I can tell, but sudo cron does the job. One … Read more