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Shell Script - Check if a file contains a specific line/string

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

0

my script contain :

#### #!/usr/bin/sh

FILE="/home/steven/.bash_profile"

STRING="export PATH="$PATH:/opt/mssql-tools/bin""



if [ -z $(grep "$STRING" "$FILE") ]; then



        echo 'the string is exist' >&2

else



        echo 'the string doesnt exist' >&2

fi

and my file contain :

#### # .bash_profile



 # Get the aliases and functions



if [ -f ~/.bashrc ]; then



        . ~/.bashrc

fi



#### # User specific environment and startup programs



PATH=$PATH:$HOME/.local/bin:$HOME/bin



export PATH

why it's always return the is exist ?
please help for this one.
many thanks.

shell-script centos

share|improve this question

edited 38 mins ago

Steven Audy

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  -z checks if the string is empty. Did you mean to use -n? Or just use grep directly: if grep -q "$STRING" "$FILE"; then ...
  
  – muru
  48 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @muru i try grep directly but failed.
  
  – Steven Audy
  39 mins ago
  

  
  
  
  

add a comment | 

0

my script contain :

#### #!/usr/bin/sh

FILE="/home/steven/.bash_profile"

STRING="export PATH="$PATH:/opt/mssql-tools/bin""



if [ -z $(grep "$STRING" "$FILE") ]; then



        echo 'the string is exist' >&2

else



        echo 'the string doesnt exist' >&2

fi

and my file contain :

#### # .bash_profile



 # Get the aliases and functions



if [ -f ~/.bashrc ]; then



        . ~/.bashrc

fi



#### # User specific environment and startup programs



PATH=$PATH:$HOME/.local/bin:$HOME/bin



export PATH

why it's always return the is exist ?
please help for this one.
many thanks.

shell-script centos

share|improve this question

edited 38 mins ago

Steven Audy

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  -z checks if the string is empty. Did you mean to use -n? Or just use grep directly: if grep -q "$STRING" "$FILE"; then ...
  
  – muru
  48 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @muru i try grep directly but failed.
  
  – Steven Audy
  39 mins ago
  

  
  
  
  

add a comment | 

my script contain :

#### #!/usr/bin/sh

FILE="/home/steven/.bash_profile"

STRING="export PATH="$PATH:/opt/mssql-tools/bin""



if [ -z $(grep "$STRING" "$FILE") ]; then



        echo 'the string is exist' >&2

else



        echo 'the string doesnt exist' >&2

fi

and my file contain :

#### # .bash_profile



 # Get the aliases and functions



if [ -f ~/.bashrc ]; then



        . ~/.bashrc

fi



#### # User specific environment and startup programs



PATH=$PATH:$HOME/.local/bin:$HOME/bin



export PATH

why it's always return the is exist ?
please help for this one.
many thanks.

shell-script centos

share|improve this question

edited 38 mins ago

Steven Audy

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

#### #!/usr/bin/sh

FILE="/home/steven/.bash_profile"

STRING="export PATH="$PATH:/opt/mssql-tools/bin""



if [ -z $(grep "$STRING" "$FILE") ]; then



        echo 'the string is exist' >&2

else



        echo 'the string doesnt exist' >&2

fi

#### # .bash_profile



 # Get the aliases and functions



if [ -f ~/.bashrc ]; then



        . ~/.bashrc

fi



#### # User specific environment and startup programs



PATH=$PATH:$HOME/.local/bin:$HOME/bin



export PATH

share|improve this question

edited 38 mins ago

Steven Audy

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

share|improve this question

edited 38 mins ago

Steven Audy

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

asked 54 mins ago

Steven AudySteven Audy

122 bronze badges

1 Answer
1

active

oldest

votes

0

We should escape the $ and " in the STRING variable. otherwise, it will expand the $PATH

Declare it as:

 STRING="export PATH="$PATH:/opt/mssql-tools/bin""

As commented by @muru, try as

if  grep -q "$STRING" "$FILE" ; then

         echo 'the string is exist' ; 

else

         echo 'the string doesnt exist' ; 

fi

Since export is missing in line no 12 of file bashrc. it will always result as doesnt exist.

share|improve this answer

edited 22 mins ago

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  #!/usr/bin/sh FILE="/home/steven/.bash_profile" STRING="export PATH="$PATH:/opt/mssql-tools/bin"" if [ -z $(grep "$STRING" "$FILE") ]; then echo 'the string is exist' >&2 else echo 'the string doesnt exist' >&2 fi it return value : 'the string is exist' again in my file there's no export PATH="$PATH:/opt/mssql-tools/bin"
  
  – Steven Audy
  33 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  prefix export is missing in your bashrc
  
  – msp9011
  24 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  remove export in the STRING variable. if it is not desired.
  
  – msp9011
  20 mins ago
  

  
  
  
  

add a comment | 

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0

We should escape the $ and " in the STRING variable. otherwise, it will expand the $PATH

Declare it as:

 STRING="export PATH="$PATH:/opt/mssql-tools/bin""

As commented by @muru, try as

if  grep -q "$STRING" "$FILE" ; then

         echo 'the string is exist' ; 

else

         echo 'the string doesnt exist' ; 

fi

Since export is missing in line no 12 of file bashrc. it will always result as doesnt exist.

share|improve this answer

edited 22 mins ago

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  #!/usr/bin/sh FILE="/home/steven/.bash_profile" STRING="export PATH="$PATH:/opt/mssql-tools/bin"" if [ -z $(grep "$STRING" "$FILE") ]; then echo 'the string is exist' >&2 else echo 'the string doesnt exist' >&2 fi it return value : 'the string is exist' again in my file there's no export PATH="$PATH:/opt/mssql-tools/bin"
  
  – Steven Audy
  33 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  prefix export is missing in your bashrc
  
  – msp9011
  24 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  remove export in the STRING variable. if it is not desired.
  
  – msp9011
  20 mins ago
  

  
  
  
  

add a comment | 

0

We should escape the $ and " in the STRING variable. otherwise, it will expand the $PATH

Declare it as:

 STRING="export PATH="$PATH:/opt/mssql-tools/bin""

As commented by @muru, try as

if  grep -q "$STRING" "$FILE" ; then

         echo 'the string is exist' ; 

else

         echo 'the string doesnt exist' ; 

fi

Since export is missing in line no 12 of file bashrc. it will always result as doesnt exist.

share|improve this answer

edited 22 mins ago

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  #!/usr/bin/sh FILE="/home/steven/.bash_profile" STRING="export PATH="$PATH:/opt/mssql-tools/bin"" if [ -z $(grep "$STRING" "$FILE") ]; then echo 'the string is exist' >&2 else echo 'the string doesnt exist' >&2 fi it return value : 'the string is exist' again in my file there's no export PATH="$PATH:/opt/mssql-tools/bin"
  
  – Steven Audy
  33 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  prefix export is missing in your bashrc
  
  – msp9011
  24 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  remove export in the STRING variable. if it is not desired.
  
  – msp9011
  20 mins ago
  

  
  
  
  

add a comment | 

We should escape the $ and " in the STRING variable. otherwise, it will expand the $PATH

Declare it as:

 STRING="export PATH="$PATH:/opt/mssql-tools/bin""

As commented by @muru, try as

if  grep -q "$STRING" "$FILE" ; then

         echo 'the string is exist' ; 

else

         echo 'the string doesnt exist' ; 

fi

Since export is missing in line no 12 of file bashrc. it will always result as doesnt exist.

share|improve this answer

edited 22 mins ago

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

 STRING="export PATH="$PATH:/opt/mssql-tools/bin""

if  grep -q "$STRING" "$FILE" ; then

         echo 'the string is exist' ; 

else

         echo 'the string doesnt exist' ; 

fi

share|improve this answer

edited 22 mins ago

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges

answered 44 mins ago

msp9011msp9011

5,30955 gold badges4242 silver badges6969 bronze badges