How to compare two dates in bash script?
I am trying to compare todays date with the last modified date from a file.
DATE=$(date +"%F")
LASTMOD=$(stat $i -c %y);
LASTMOD_DATE=$(cut -d' ' -f1 <<<"$LASTMOD")
if [ "$LASTMOD_DATE" -ge "$DATE" ]; then
printf "%-19s | " "$DATE"
else
printf "%-19s | " "NO RECENT MOD"
fi
Currently this does not compare them properly and I think it's because LASTMOD_DATE is not actually a datetime so I get the error: "integer expression expected".
bash shell-script date
asked 30 mins ago
AustinAustin
1
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I am trying to compare todays date with the last modified date from a file.
DATE=$(date +"%F")
LASTMOD=$(stat $i -c %y);
LASTMOD_DATE=$(cut -d' ' -f1 <<<"$LASTMOD")
if [ "$LASTMOD_DATE" -ge "$DATE" ]; then
printf "%-19s | " "$DATE"
else
printf "%-19s | " "NO RECENT MOD"
fi
Currently this does not compare them properly and I think it's because LASTMOD_DATE is not actually a datetime so I get the error: "integer expression expected".
bash shell-script date
asked 30 mins ago
AustinAustin
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I am trying to compare todays date with the last modified date from a file.
DATE=$(date +"%F")
LASTMOD=$(stat $i -c %y);
LASTMOD_DATE=$(cut -d' ' -f1 <<<"$LASTMOD")
if [ "$LASTMOD_DATE" -ge "$DATE" ]; then
printf "%-19s | " "$DATE"
else
printf "%-19s | " "NO RECENT MOD"
fi
Currently this does not compare them properly and I think it's because LASTMOD_DATE is not actually a datetime so I get the error: "integer expression expected".
bash shell-script date
asked 30 mins ago
AustinAustin
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am trying to compare todays date with the last modified date from a file.
DATE=$(date +"%F")
LASTMOD=$(stat $i -c %y);
LASTMOD_DATE=$(cut -d' ' -f1 <<<"$LASTMOD")
if [ "$LASTMOD_DATE" -ge "$DATE" ]; then
printf "%-19s | " "$DATE"
else
printf "%-19s | " "NO RECENT MOD"
fi
Currently this does not compare them properly and I think it's because LASTMOD_DATE is not actually a datetime so I get the error: "integer expression expected".
bash shell-script date
bash shell-script date
asked 30 mins ago
AustinAustin
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
AustinAustin
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
AustinAustin
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
AustinAustin
1
asked 30 mins ago
AustinAustin
1
1
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Austin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
You can use the timestamp format date +%s and the -r option.
-r, --reference=FILE
display the last modification time of FILE
like
if [ $(date +%s -r file) -ge $(date +%s) ]; then
# do something
fi
answered 11 mins ago
FreddyFreddy
3898
add a comment |
The best way to compare points of time (dates) is in seconds (since Epoch).
Changing the %y to %Y for stat will give the modification date of the file in seconds:
fileModifiedOn=$(stat $i -c %y)
Today's date could be read either with (GNU) date with the format %s:
todayDate=$(date +'%s')
or, in Bash 5.0, with the variable epochseconds:
todayDate=$EPOCHSECONDS
or, in older bash, with a (buildin) printf format:
todayDate=$(printf '%(%s)T')
Then, it is just a matter of a simple integer comparison:
if [[ "$fileModifiedOn" -gt "$todayDate" ]] then
result=$todayDate
else
result="NO RECENT MOD"
fi
printf "%-19s | " "$result"
answered 29 secs ago
IsaacIsaac
12k11852
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use the timestamp format date +%s and the -r option.
-r, --reference=FILE
display the last modification time of FILE
like
if [ $(date +%s -r file) -ge $(date +%s) ]; then
# do something
fi
answered 11 mins ago
FreddyFreddy
3898
add a comment |
You can use the timestamp format date +%s and the -r option.
-r, --reference=FILE
display the last modification time of FILE
like
if [ $(date +%s -r file) -ge $(date +%s) ]; then
# do something
fi
answered 11 mins ago
FreddyFreddy
3898
add a comment |
You can use the timestamp format date +%s and the -r option.
-r, --reference=FILE
display the last modification time of FILE
like
if [ $(date +%s -r file) -ge $(date +%s) ]; then
# do something
fi
answered 11 mins ago
FreddyFreddy
3898
You can use the timestamp format date +%s and the -r option.
-r, --reference=FILE
display the last modification time of FILE
like
if [ $(date +%s -r file) -ge $(date +%s) ]; then
# do something
fi
answered 11 mins ago
FreddyFreddy
3898
answered 11 mins ago
FreddyFreddy
3898
answered 11 mins ago
FreddyFreddy
3898
answered 11 mins ago
FreddyFreddy
3898
3898
add a comment |
add a comment |
The best way to compare points of time (dates) is in seconds (since Epoch).
Changing the %y to %Y for stat will give the modification date of the file in seconds:
fileModifiedOn=$(stat $i -c %y)
Today's date could be read either with (GNU) date with the format %s:
todayDate=$(date +'%s')
or, in Bash 5.0, with the variable epochseconds:
todayDate=$EPOCHSECONDS
or, in older bash, with a (buildin) printf format:
todayDate=$(printf '%(%s)T')
Then, it is just a matter of a simple integer comparison:
if [[ "$fileModifiedOn" -gt "$todayDate" ]] then
result=$todayDate
else
result="NO RECENT MOD"
fi
printf "%-19s | " "$result"
answered 29 secs ago
IsaacIsaac
12k11852
add a comment |
The best way to compare points of time (dates) is in seconds (since Epoch).
Changing the %y to %Y for stat will give the modification date of the file in seconds:
fileModifiedOn=$(stat $i -c %y)
Today's date could be read either with (GNU) date with the format %s:
todayDate=$(date +'%s')
or, in Bash 5.0, with the variable epochseconds:
todayDate=$EPOCHSECONDS
or, in older bash, with a (buildin) printf format:
todayDate=$(printf '%(%s)T')
Then, it is just a matter of a simple integer comparison:
if [[ "$fileModifiedOn" -gt "$todayDate" ]] then
result=$todayDate
else
result="NO RECENT MOD"
fi
printf "%-19s | " "$result"
answered 29 secs ago
IsaacIsaac
12k11852
add a comment |
The best way to compare points of time (dates) is in seconds (since Epoch).
Changing the %y to %Y for stat will give the modification date of the file in seconds:
fileModifiedOn=$(stat $i -c %y)
Today's date could be read either with (GNU) date with the format %s:
todayDate=$(date +'%s')
or, in Bash 5.0, with the variable epochseconds:
todayDate=$EPOCHSECONDS
or, in older bash, with a (buildin) printf format:
todayDate=$(printf '%(%s)T')
Then, it is just a matter of a simple integer comparison:
if [[ "$fileModifiedOn" -gt "$todayDate" ]] then
result=$todayDate
else
result="NO RECENT MOD"
fi
printf "%-19s | " "$result"
answered 29 secs ago
IsaacIsaac
12k11852
The best way to compare points of time (dates) is in seconds (since Epoch).
Changing the %y to %Y for stat will give the modification date of the file in seconds:
fileModifiedOn=$(stat $i -c %y)
Today's date could be read either with (GNU) date with the format %s:
todayDate=$(date +'%s')
or, in Bash 5.0, with the variable epochseconds:
todayDate=$EPOCHSECONDS
or, in older bash, with a (buildin) printf format:
todayDate=$(printf '%(%s)T')
Then, it is just a matter of a simple integer comparison:
if [[ "$fileModifiedOn" -gt "$todayDate" ]] then
result=$todayDate
else
result="NO RECENT MOD"
fi
printf "%-19s | " "$result"
answered 29 secs ago
IsaacIsaac
12k11852
answered 29 secs ago
IsaacIsaac
12k11852
answered 29 secs ago
IsaacIsaac
12k11852
answered 29 secs ago
IsaacIsaac
12k11852
12k11852
add a comment |
add a comment |
Austin is a new contributor. Be nice, and check out our Code of Conduct.
Austin is a new contributor. Be nice, and check out our Code of Conduct.
Austin is a new contributor. Be nice, and check out our Code of Conduct.
Austin is a new contributor. Be nice, and check out our Code of Conduct.
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