eval removes backslash


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers eval removes backslash
# 1  
Old 01-10-2010
eval removes backslash

Hi,
=============
In one of my config files, I have below command
eval echo RECORDDELIMITER '\n'

The above command results in removing backslash and outputs:
RECORDDELIMITER n
=============
Any workaround to retain the backslash after eval.

Appreciated for your help.
axes
# 2  
Old 01-10-2010
I would try inserting another backslash.

Code:
eval echo RECORDDELIMITER '\\n'

If that doesn't work then it might be worth trying it with double quotes (").
# 3  
Old 01-10-2010
Try "'\n'"

Quote:
Originally Posted by axes
Hi,
=============
In one of my config files, I have below command
eval echo RECORDDELIMITER '\n'

The above command results in removing backslash and outputs:
RECORDDELIMITER n
=============
Any workaround to retain the backslash after eval.

Appreciated for your help.
Hello,

"'\n'" gives an output as \n

Regards
# 4  
Old 01-10-2010
Hi,
I tried all the possibilities. But nothing is giving output as \n

axes > eval echo RECORDDELIMITER '\\n'
RECORDDELIMITER

axes >eval echo RECORDDELIMITER "\\n"
RECORDDELIMITER n

axes >eval echo RECORDDELIMITER "'\n'"
RECORDDELIMITER
axes
# 5  
Old 01-10-2010
Quote:
eval echo RECORDDELIMITER '\\\\n'
# 6  
Old 01-10-2010
Thanks anbu23

Excellent, it's working fine.
axes
# 7  
Old 06-20-2010
Why did specifically 4 backslashes work ?

I can't understand why inserting 4 backslashes instead of 2 or 3 worked
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk removes delimiter unexpectedly

datafile: blah,blah,blah,blah,blah,blah,blah,blah,blah=0_nblah=0-- ,blah,blah,blah im using the following command to turn the "_n" and "-- " to just a space " " only in the $9th field. meaning, it has to make the changes only in the 9th column/field of the datafile. awk -F, '{... (1 Reply)
Discussion started by: SkySmart
1 Replies

2. UNIX for Dummies Questions & Answers

Why awk removes delimiters?

Code : echo "1,2,3,4"|awk -F "," 'NR==n{$3=a}1' n=1 a=45 Output : 1 2 45 4 Expected : 1,2,45,4 (4 Replies)
Discussion started by: Rajesh_us
4 Replies

3. Shell Programming and Scripting

Sed: removes \ from text which causes issues

Hi all, Hoping someone hoping someone might be able to help. i've got the following sed command which i'm using in a bash script that i'm trying to use to insert a new line into an already existing file so i don't have to manually enter it when setting stuff up. the existing script test2/3 are... (3 Replies)
Discussion started by: springs2
3 Replies

4. Shell Programming and Scripting

Error in eval eval command to print html tags

anyone has any info on why this is complaining??? vivek@vivek-c5e55ef2e ~/TAC $ zoneCounter=1 vivek@vivek-c5e55ef2e ~/TAC $ optUsage1=23% vivek@vivek-c5e55ef2e ~/TAC $ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>" -bash: syntax error... (13 Replies)
Discussion started by: vivek d r
13 Replies

5. Shell Programming and Scripting

Error in eval eval command to print html tags

anyone has any info on why this is complaining??? vivek@vivek-c5e55ef2e ~/TAC $ zoneCounter=1 vivek@vivek-c5e55ef2e ~/TAC $ optUsage1=23% vivek@vivek-c5e55ef2e ~/TAC $ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>" -bash: syntax error... (1 Reply)
Discussion started by: vivek d r
1 Replies

6. UNIX for Advanced & Expert Users

perl/sed -i removes link

hello, is it a behavior of or that "-i" removes unix link . example : i create a file "src_file" and link it to "link_file" and then i start "perl -i" the link is removed. does another option exists to change content of a file without temporary files ? UNIX-Version: HP-UX and... (2 Replies)
Discussion started by: bora99
2 Replies

7. Ubuntu

Aptitude removes all packages

Hi Team, Please find below error. I got this after i done something in aptitude. Actually i was trying to update all packages, but unfortunately I removed all packages. Now my server is down. When i boot it gives me me errors of missing .so files. Is there any way to repair my server... (2 Replies)
Discussion started by: paragnehete
2 Replies

8. Shell Programming and Scripting

Strange result of eval, how does eval really work with ssh?

Hi all, some small script with eval turned me to crazy. my OS is linux Linux s10-1310 2.6.16.53-0.8.PTF.434477.3.TDC.0-smp #1 SMP Fri Aug 31 06:07:27 PDT 2007 x86_64 x86_64 x86_64 GNU/Linux below script works well #!/bin/bash eval ssh remotehost date eval ssh remotehost ls below... (1 Reply)
Discussion started by: summer_cherry
1 Replies

9. UNIX for Advanced & Expert Users

GAWK removes FS | on output

I have the simple gawk script below. When the script runs in the output of all the ITM lines the FS is replaced with a space, the Non ITM lines retain the | field separator. The ITM lines have many fields and I can't insert "|" between each field because some of the fields are blank. Is... (1 Reply)
Discussion started by: paulr211
1 Replies

10. Shell Programming and Scripting

Script removes itself

I have a script that reads from a file and deletes all files in tha path specified in the file.The problem,however, is the script also deletes itself from the home directory where I run it :-( #!/bin/ksh while read DAYS PURGE_PATH do cd $PURGE_PATH find . \( -type d ! -name . -prune \)... (5 Replies)
Discussion started by: kayarsenal
5 Replies
Login or Register to Ask a Question