How to use the ">" operator in a systemd file?-CodePudding

This is my systemd service file:

[Unit]
Description=Foo

[Service]
WorkingDirectory=/tmp/test
ExecStartPre=/usr/bin/yq -o json config.yaml > config.json
ExecStart=/usr/bin/foo run -c config.json

[Install]
WantedBy=multi-user.target

Everything working if I run ExecStartPre and ExecStart in the shell. But got error when I run systemctl start foo.service:

Error: open >: no such file or directory

Seems the ">" operator doesn't work as shell in the systemd file.

CodePudding user response：

ExecStartPre doesn't use the shell to execute the command, so you can't use shell operators like redirection.

You'll need to invoke the shell explicitly.

ExecStartPre=bash -c '/usr/bin/yq -o json config.yaml > config.json'

CodePudding user response：

Try:

ExecStartPre=/usr/bin/yq -o json config.yaml | tee -a config.json

or:

ExecStartPre=/bin/bash -c '/usr/bin/yq -o json config.yaml > config.json'