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Top Forums Shell Programming and Scripting Convert Date from File and Calculate Duration Post 302637285 by Corona688 on Tuesday 8th of May 2012 04:07:22 PM
Old 05-08-2012
date -d saves you a lot of pain when you have it, but is Linux-only.

I have in filename:
Code:
2010100912000145
2010100912000955

And the script:
Code:
#!/bin/bash

exec 5<filename    # Open file into FD 5
read T1 <&5
read T2 <&5

# Arrange them how GNU date wants it YYYYMMDD HH:MM:SS.SS
T1="${T1:0:8} ${T1:8:2}:${T1:10:2}:${T1:12:2}.${T1:14}"
T2="${T2:0:8} ${T2:8:2}:${T2:10:2}:${T2:12:2}.${T2:14}"

# Convert into epoch seconds
E1=$(date -d "$T1" +%s)
E2=$(date -d "$T2" +%s)

echo "E2-E1 = $((E2-E1))"

exec 5<&-       # Close FD 5

does this:

Code:
E2-E1 = 8

These 2 Users Gave Thanks to Corona688 For This Post:
 

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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