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05-09-2005, 04:04 AM
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#1
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Member
Registered: May 2005
Location: Paris, france
Posts: 53
Rep:
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How to execute a command line in a shell script
Hello!
I'm coding a shell script at this time, and i wanted to know how i could execute a command line in this shell script.
To give you more details, i try to execute ffmpeg with some arguments, it looks like that: ./ffmpeg -an -b 400 -i video.mpg video.m4v.
Thank you for your help.
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05-09-2005, 04:16 AM
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#2
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Member
Registered: Nov 2003
Location: Bristol, UK
Distribution: Debian Lenny, Gentoo (at work)
Posts: 388
Rep:
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You just put that line in the script.
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05-09-2005, 04:20 AM
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#3
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Member
Registered: Jan 2004
Location: Munich
Distribution: SuSE 9.2, 10.2, 10.3, knoppix
Posts: 276
Rep:
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Simply include the line in your shell script (without the ./); you need to make sure that the PATH variable contains the path to ffmpeg (usually /usr/local/lib, if I remember correctly).
This will help in most cases (flames welcome):
At the console, type
echo $PATH >> </path/to/your/script/your_script.sh>
then open the script with any text editor, copy the last line to the second line (first will probably read #!/bin/bash), then write at the beginning of the line
PATH=$PATH:
If your path is not included in said line, add it to the end with <:/your/path>
Example:
#!/bin/bash
PATH=$PATH:/bin:/sbin:/your/path
ffmpeg ...
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05-09-2005, 04:31 AM
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#4
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Member
Registered: May 2005
Location: Paris, france
Posts: 53
Original Poster
Rep:
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ok thanks... but do i really need to set the path???
It should be in usr/local/bin, not lib since it's an executable... but if i put it in the same path that my script, it could work?
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05-09-2005, 06:33 AM
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#5
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Member
Registered: Jan 2004
Location: Munich
Distribution: SuSE 9.2, 10.2, 10.3, knoppix
Posts: 276
Rep:
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If it has no further dependancies, yes. Use
ldd <your_binary>
to see which libraries ffmpeg depends on. But I'd say its rather ugly under *NIX to keep binaries in other directories than those specified in file hierarchy standard, see
http://www.pathname.com/fhs/
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05-09-2005, 09:16 AM
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#6
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Member
Registered: May 2005
Location: Paris, france
Posts: 53
Original Poster
Rep:
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Ok thanks.
I need help one more time
Something very simple in fact but i do not know how the if else and while tests work in shell bash...
I use a line like that, the same that i use in C-C++...
Test:
[...]
while (sed -n '$jp' ls_mpg.txt && $ok == 0)
do
if (sed -n '$jp' ls_mpg.txt == sed -n '$in' ls_mp4.txt) then
$ok = 1
fi
[...]
does this ("sed -n '$jp' ls_mpg.txt && $ok == 0") works?
Thank you for your help
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