How to append a file with the existing one using CURL?
Use the shell’s appending output redirection (>>) rather than curl’s –output option. curl http://192.99.8.170:8098/stream >> test.pls
shell
docker alpine /bin/sh script.sh not found
Make sure the shebang on the script points to an interpreter that actually exists. Thus, if the script being invoked uses: #!/bin/bash …then /bin/bash needs to actually be installed. (Alternately, you might consider trying to port the script to work with POSIX sh, and modifying its shebang to /bin/sh).
Is the shell’s `source` POSIX-standard?
It’s there under “dot”. NAME dot – execute commands in the current environment SYNOPSIS . file [etc.]
How to export multiple variables with same value in ksh?
Ksh93 (or bash) doesn’t have such expressions, so it’s better to make it explicit. But you can bundle multiple variables (with their initial values) in a single export phrase: export A=1 B=2 C=3 Testing: $ (export A=1 B=2 C=3 && ksh -c ‘echo A=$A B=$B C=$C D=$D’) A=1 B=2 C=3 D= Awkward alternatives There is … Read more
Run batch file with psql command without password
Keep reading, the best options come last. But let’s clarify a couple of things first. Only silence the password request If your issue is only the password prompt, you can silence it. I quote the manual here: -w –no-password Never issue a password prompt. If the server requires password authentication and a password is not … Read more
How to write Unix shell scripts with options?
$ cat stack.sh #!/bin/sh if [[ $1 = “-o” ]]; then echo “Option -o turned on” else echo “You did not use option -o” fi $ bash stack.sh -o Option -o turned on $ bash stack.sh You did not use option -o FYI: $1 = First positional parameter $2 = Second positional parameter .. = … Read more
Vim [compile and] run shortcut
Something like this would work. Just create filetype autocmd that map <F4> or whatever you want to save and compile and run the program. It uses exec to build the string and uses shellescape to escape the file name. autocmd filetype python nnoremap <F4> :w <bar> exec ‘!python ‘.shellescape(‘%’)<CR> autocmd filetype c nnoremap <F4> :w … Read more
Match empty lines in a file with ‘grep’
The regular expression to match the end of the line is $, not \n (since grep works a line at a time, it ignores the newlines between lines). grep -c ‘^$’ myfile.txt
grab last n lines from console output
./run_some_process 2>&1 | tail -10 >>logfle tail -10 will give you last ten lines, 2>&1 redirects stderr to stdout, >>logfle appends to logfile.
How to check if dir exists over ssh and return results to host machine [duplicate]
You are very close: Change if statement to if ssh username@ssh_server ‘[ -d /directory ]’ I am assuming that you have setup key-based authentication.