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Parse `df` output for `/dev/disk/by-uuid/xxx`

wait for dd command to fully write to the diskRedirecting output to std output or /dev/null depending on optional parameterParse file for recursive patternTroubles piping echo output to xargs script for mv commandNo logging output for cron jobOutput log for bashParse xrandr output to get available resolutionscript for output which having same name as directorySynchronized combination of for loops' outputParse multiline output with bash

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;

0

I would like to ask you why this command work

df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g'

But not this one?

df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g'

Something to change or is impossible that work with uuid?

This is my full script

#!/bin/bash
inputa=90 
#outputa=$(df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g')
outputa=$(df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g') 

if [ "$inputa -lt $outputa" ]
then 
 find /home/user/Documents/ipcams/ipcam2 -type f -name "*.mp4" -mtime +25 -exec rm ;
 (date +"%Y-%m-%d Heure: %H-%M-%S") >> /home/user/ipcam.log
 echo Pourcentage $outputa "%" >> /home/user/ipcam.log

else echo rien

fi

Have a great day

Thanks

command-line bash

share|improve this question

edited May 30 at 13:05

John

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

add a comment
 | 

0

I would like to ask you why this command work

df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g'

But not this one?

df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g'

Something to change or is impossible that work with uuid?

This is my full script

#!/bin/bash
inputa=90 
#outputa=$(df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g')
outputa=$(df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g') 

if [ "$inputa -lt $outputa" ]
then 
 find /home/user/Documents/ipcams/ipcam2 -type f -name "*.mp4" -mtime +25 -exec rm ;
 (date +"%Y-%m-%d Heure: %H-%M-%S") >> /home/user/ipcam.log
 echo Pourcentage $outputa "%" >> /home/user/ipcam.log

else echo rien

fi

Have a great day

Thanks

command-line bash

share|improve this question

edited May 30 at 13:05

John

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

add a comment
 | 

I would like to ask you why this command work

df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g'

But not this one?

df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g'

Something to change or is impossible that work with uuid?

This is my full script

#!/bin/bash
inputa=90 
#outputa=$(df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g')
outputa=$(df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g') 

if [ "$inputa -lt $outputa" ]
then 
 find /home/user/Documents/ipcams/ipcam2 -type f -name "*.mp4" -mtime +25 -exec rm ;
 (date +"%Y-%m-%d Heure: %H-%M-%S") >> /home/user/ipcam.log
 echo Pourcentage $outputa "%" >> /home/user/ipcam.log

else echo rien

fi

Have a great day

Thanks

command-line bash

share|improve this question

edited May 30 at 13:05

John

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g'

df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g'

#!/bin/bash
inputa=90 
#outputa=$(df -P /dev/sda1 | grep /dev/sda1 | awk ' print $5' | sed 's/%//g')
outputa=$(df -P /dev/disk/by-uuid/0E5E17800E5E1780 | grep /dev/disk/by-uuid/0E5E17800E5E1780 | awk ' print $5' | sed 's/%//g') 

if [ "$inputa -lt $outputa" ]
then 
 find /home/user/Documents/ipcams/ipcam2 -type f -name "*.mp4" -mtime +25 -exec rm ;
 (date +"%Y-%m-%d Heure: %H-%M-%S") >> /home/user/ipcam.log
 echo Pourcentage $outputa "%" >> /home/user/ipcam.log

else echo rien

fi

share|improve this question

edited May 30 at 13:05

John

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

share|improve this question

edited May 30 at 13:05

John

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

asked May 30 at 12:20

JohnJohn

8611 gold badge11 silver badge66 bronze badges

2 Answers
2

active

oldest

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2

The problem is that although df shows information about the device specified by the UUID, the first column of its output still refers to it by the /dev/sdXY block device name - so the grep fails to match.

In fact, there's no need to use grep at all - you can use awk to skip the header line (and even to remove the % sign):

$ df -P /dev/sda1 | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

$ df -P /dev/disk/by-uuid/79b5546e-5b3e-4299-becb-5f0cad06cf5f | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

share|improve this answer

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

add a comment
 | 

1

/dev/disk/by-uuid/0E5E17800E5E178 is a link to a Device, which may or may not contain a Filesystem. df works only on filesystems, not raw devices. From man df:

df displays the amount of disk space available on the file system containing each file name argument.

share|improve this answer

answered May 30 at 12:34

waltinatorwaltinator

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 | 

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2

The problem is that although df shows information about the device specified by the UUID, the first column of its output still refers to it by the /dev/sdXY block device name - so the grep fails to match.

In fact, there's no need to use grep at all - you can use awk to skip the header line (and even to remove the % sign):

$ df -P /dev/sda1 | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

$ df -P /dev/disk/by-uuid/79b5546e-5b3e-4299-becb-5f0cad06cf5f | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

share|improve this answer

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

add a comment
 | 

2

The problem is that although df shows information about the device specified by the UUID, the first column of its output still refers to it by the /dev/sdXY block device name - so the grep fails to match.

In fact, there's no need to use grep at all - you can use awk to skip the header line (and even to remove the % sign):

$ df -P /dev/sda1 | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

$ df -P /dev/disk/by-uuid/79b5546e-5b3e-4299-becb-5f0cad06cf5f | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

share|improve this answer

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

add a comment
 | 

The problem is that although df shows information about the device specified by the UUID, the first column of its output still refers to it by the /dev/sdXY block device name - so the grep fails to match.

In fact, there's no need to use grep at all - you can use awk to skip the header line (and even to remove the % sign):

$ df -P /dev/sda1 | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

$ df -P /dev/disk/by-uuid/79b5546e-5b3e-4299-becb-5f0cad06cf5f | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

share|improve this answer

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

$ df -P /dev/sda1 | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

$ df -P /dev/disk/by-uuid/79b5546e-5b3e-4299-becb-5f0cad06cf5f | awk 'NR == 2 print substr($5,1,length($5)-1) '
80

share|improve this answer

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

answered May 30 at 12:33

steeldriversteeldriver

80.6k1212 gold badges131131 silver badges216216 bronze badges

1

/dev/disk/by-uuid/0E5E17800E5E178 is a link to a Device, which may or may not contain a Filesystem. df works only on filesystems, not raw devices. From man df:

df displays the amount of disk space available on the file system containing each file name argument.

share|improve this answer

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges

add a comment
 | 

1

/dev/disk/by-uuid/0E5E17800E5E178 is a link to a Device, which may or may not contain a Filesystem. df works only on filesystems, not raw devices. From man df:

df displays the amount of disk space available on the file system containing each file name argument.

share|improve this answer

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges

add a comment
 | 

/dev/disk/by-uuid/0E5E17800E5E178 is a link to a Device, which may or may not contain a Filesystem. df works only on filesystems, not raw devices. From man df:

df displays the amount of disk space available on the file system containing each file name argument.

share|improve this answer

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges

df displays the amount of disk space available on the file system containing each file name argument.

share|improve this answer

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges

answered May 30 at 12:34

waltinatorwaltinator

25.1k77 gold badges4343 silver badges7474 bronze badges