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Creating a function for timestamp in shell script

 
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# 1  
Old 04-07-2009
Creating a function for timestamp in shell script
I have the following code for installing a BSD application stack:
Code:
#!/bin/sh

# install dos2unix and unix2dos utilities
echo `date "+%Y-%m-%d %H:%M:%S"` "unix2dos and dos2unix: installing..." >> ~/post_install.log
pkg_add -r unix2dos

# install xfce4 desktop environment
echo `date "+%Y-%m-%d %H:%M:%S"` "xfce: installing..." >> ~/post_install.log
pkg_add -r xfce4

I would like the timestamp to be recalculated so that the log shows actual timings. But a function should be created instead for efficiency purposes, say datetime:
Code:
datetime() { echo `date "+%Y-%m-%d %H:%M:%S"` }

so that the following follows
Code:
#!/bin/sh

# install dos2unix and unix2dos utilities
echo datetime "unix2dos and dos2unix: installing..." >> ~/post_install.log
pkg_add -r unix2dos

# install xfce4 desktop environment
echo datetime "xfce: installing..." >> ~/post_install.log
pkg_add -r xfce4

But then the literal 'datetime' shows up in the post_install log. What is the exact syntax to use here?
# 2  
Old 04-07-2009
Quote:
Originally Posted by figaro
[...]
I would like the timestamp to be recalculated so that the log shows actual timings. But a function should be created instead for efficiency purposes
I don't see how a function that performs the same
code as the command substitution could be more efficient.


Quote:
But then the literal 'datetime' shows up in the post_install log. What is the exact syntax to use here?
You still need command substitution:

Code:
echo $(datetime)

P.S. I believe the correct syntax is:

Code:
datetime() { echo `date "+%Y-%m-%d %H:%M:%S"` ;}

Or:

Code:
datetime() { 
  echo `date "+%Y-%m-%d %H:%M:%S"` 
  }

# 3  
Old 04-07-2009
Thanks, your suggestion worked very well. On the efficiency note: I was referring to refactoring, not memory usage or performance.
# 4  
Old 04-07-2009
Quote:
Originally Posted by figaro
Thanks, your suggestion worked very well. On the efficiency note: I was referring to refactoring, not memory usage or performance.
Agreed, that makes sense.
 
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