I am using OptionParser(), and define the following:
parser.add_option("--cmd", dest="command", help="command to run")
However, if i provide a complex shell command, such as :
python shell.py --cmd "for i in `seq 1 10`; do xxx; done"
And internally print options.command, i get something unexpected to me:
for i in 1
2
3
4
5
6
7
8
9
10; do
Is there a good way to pass an OptionParser option which is a shell command?
When invoking:
python shell.py --cmd "for i in `seq 1 10`; do xxx; done"
The shell first substitute the command enclosed in ` with its output. Thus, the command you actually invoke is:
python shell.py --cmd "for i in 1
2
3
4
5
6
7
8
9
10; do ..."
To avoid this:
Escape the ` character when invoking the command:
python shell.py --cmd "for i in \`seq 1 10\`; do xxx; done"
Use strong quoting (string enclosed in ')
python shell.py --cmd 'for i in `seq 1 10`; do xxx; done'