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awk syntax error inside script while assigning it to a variable

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1

Basically memory is a variable. In a script, I am trying to remote login to one server and execute free command to check memory usage and using awk I'm getting the usage in percentage. But I am getting syntax error for the below.

memory=`ssh $line -n "free | grep Mem | awk ' print $3/$2 *100.0 '"`

echo -e "The memory usage is: $memory" >>$LOGFILE

Error is:

awk: print / *100.0 
awk: ^ unterminated regexp
awk: cmd. line:1: print / *100.0 
awk: cmd. line:1: ^ unexpected newline or end of string

awk

share|improve this question

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 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 | 

1

Basically memory is a variable. In a script, I am trying to remote login to one server and execute free command to check memory usage and using awk I'm getting the usage in percentage. But I am getting syntax error for the below.

memory=`ssh $line -n "free | grep Mem | awk ' print $3/$2 *100.0 '"`

echo -e "The memory usage is: $memory" >>$LOGFILE

Error is:

awk: print / *100.0 
awk: ^ unterminated regexp
awk: cmd. line:1: print / *100.0 
awk: cmd. line:1: ^ unexpected newline or end of string

awk

share|improve this question

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 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 | 

Basically memory is a variable. In a script, I am trying to remote login to one server and execute free command to check memory usage and using awk I'm getting the usage in percentage. But I am getting syntax error for the below.

memory=`ssh $line -n "free | grep Mem | awk ' print $3/$2 *100.0 '"`

echo -e "The memory usage is: $memory" >>$LOGFILE

Error is:

awk: print / *100.0 
awk: ^ unterminated regexp
awk: cmd. line:1: print / *100.0 
awk: cmd. line:1: ^ unexpected newline or end of string

awk

share|improve this question

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

memory=`ssh $line -n "free | grep Mem | awk ' print $3/$2 *100.0 '"`

echo -e "The memory usage is: $memory" >>$LOGFILE

awk: print / *100.0 
awk: ^ unterminated regexp
awk: cmd. line:1: print / *100.0 
awk: cmd. line:1: ^ unexpected newline or end of string

share|improve this question

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

edited Apr 17 at 12:27

Rui F Ribeiro

42.2k1484142

asked Apr 17 at 11:58

user347628user347628

61

New contributor

user347628 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 17 at 11:58

user347628user347628

61

1 Answer
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4

Problem is that $3 and $2 are substituted by the shell (with nothing when unassigned) before the command runs, because they are enclosed in double quotes.

The single quotes inside the double quotes don't prevent that:

$ echo "'$unassigned'"
''

You should escape the $:

memory=$(ssh $line -n "free | awk '/Mem/ print $3/$2 *100.0 '")

---

Alternatively, you could run only free on the server, and awk on the client.

memory=$(ssh $line -n "free" | awk '/Mem/ print $3/$2 *100.0 ')

share|improve this answer

edited Apr 17 at 12:46

answered Apr 17 at 12:25

RoVoRoVo

3,980317

add a comment | 

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4

Problem is that $3 and $2 are substituted by the shell (with nothing when unassigned) before the command runs, because they are enclosed in double quotes.

The single quotes inside the double quotes don't prevent that:

$ echo "'$unassigned'"
''

You should escape the $:

memory=$(ssh $line -n "free | awk '/Mem/ print $3/$2 *100.0 '")

---

Alternatively, you could run only free on the server, and awk on the client.

memory=$(ssh $line -n "free" | awk '/Mem/ print $3/$2 *100.0 ')

share|improve this answer

edited Apr 17 at 12:46

answered Apr 17 at 12:25

RoVoRoVo

3,980317

add a comment | 

4

Problem is that $3 and $2 are substituted by the shell (with nothing when unassigned) before the command runs, because they are enclosed in double quotes.

The single quotes inside the double quotes don't prevent that:

$ echo "'$unassigned'"
''

You should escape the $:

memory=$(ssh $line -n "free | awk '/Mem/ print $3/$2 *100.0 '")

---

Alternatively, you could run only free on the server, and awk on the client.

memory=$(ssh $line -n "free" | awk '/Mem/ print $3/$2 *100.0 ')

share|improve this answer

edited Apr 17 at 12:46

answered Apr 17 at 12:25

RoVoRoVo

3,980317

add a comment | 

Problem is that $3 and $2 are substituted by the shell (with nothing when unassigned) before the command runs, because they are enclosed in double quotes.

The single quotes inside the double quotes don't prevent that:

$ echo "'$unassigned'"
''

You should escape the $:

memory=$(ssh $line -n "free | awk '/Mem/ print $3/$2 *100.0 '")

---

Alternatively, you could run only free on the server, and awk on the client.

memory=$(ssh $line -n "free" | awk '/Mem/ print $3/$2 *100.0 ')

share|improve this answer

edited Apr 17 at 12:46

answered Apr 17 at 12:25

RoVoRoVo

3,980317

$ echo "'$unassigned'"
''

memory=$(ssh $line -n "free | awk '/Mem/ print $3/$2 *100.0 '")

memory=$(ssh $line -n "free" | awk '/Mem/ print $3/$2 *100.0 ')

share|improve this answer

edited Apr 17 at 12:46

answered Apr 17 at 12:25

RoVoRoVo

3,980317

answered Apr 17 at 12:25

RoVoRoVo

3,980317

answered Apr 17 at 12:25

RoVoRoVo

3,980317