I wish to replace "\\n" with a single white space.
The below does the job on command-line:
$ echo '/fin/app/scripts\\n/fin/app/01/sql' | sed -e 's#\\\\n# #g';
/fin/app/scripts /fin/app/01/sql
However, when i have the same code to a shell script it is not able to get me the same output: See below:
$ more check.sh
str=`echo "$1" | sed -e 's#\\\\n# #g'`
echo $str>check.now
$ bash -x ./check.sh '/fin/app/01/scripts\\n/fin/app/01/sql'
++ echo '/fin/app/01/scripts\\n/fin/app/01/sql'
++ sed -e 's#\\n# #g'
+ str='/fin/app/01/scripts\ /fin/app/01/sql'
+ echo '/fin/app/01/scripts\' /fin/app/01/sql
$ more check.now
/fin/app/01/scripts\ /fin/app/01/INFENG/sql
We see the issue with "/fin/app/01/scripts\" the trailing \ at the end of the first string.
Note: I have to pass the argument to check.sh script strictly in single quotes only.
Requesting suggestions and explanations for this issue.
anbu23
2
$ cat check.sh
str=`echo $1 | sed -e 's#[\][\]n# #g'`
echo $str>check.now
$ bash -x ./check.sh '/fin/app/01/scripts\\n/fin/app/01/sql'
++ echo '/fin/app/01/scripts\\n/fin/app/01/sql'
++ sed -e 's#[\][\]n# #g'
+ str='/fin/app/01/scripts /fin/app/01/sql'
+ echo /fin/app/01/scripts /fin/app/01/sql
$ more check.now
/fin/app/01/scripts /fin/app/01/sql
$
I think you suffer from the \ handling within `backticks`
Demonstration:
cat check.sh
str=`echo "$1" | sed -e 's#\\\\n# #g'`
echo "$str"
str=$(echo "$1" | sed -e 's#\\\\n# #g')
echo "$str"
bash ./check.sh '/fin/app/01/scripts\\n/fin/app/01/sql'
/fin/app/01/scripts\ /fin/app/01/sql
/fin/app/01/scripts /fin/app/01/sql
You could try something like this:
Longhand OSX 10.14.3, default bash terminal using 'dash'...
Last login: Tue Sep 3 18:18:39 on ttys000
AMIGA:amiga~> dash
AMIGA:\u\w> text='oiweroiweroi oieurowir lkj
> asdkjd pqowepom,xcm909184 ;lk
> 0912830980n kjhksjdfkj oizxc
>
> '
AMIGA:\u\w> echo "${text}"
oiweroiweroi oieurowir lkj
asdkjd pqowepom,xcm909184 ;lk
0912830980n kjhksjdfkj oizxc
AMIGA:\u\w> text1=$( echo $text )
AMIGA:\u\w> echo "${text1}"
oiweroiweroi oieurowir lkj asdkjd pqowepom,xcm909184 ;lk 0912830980n kjhksjdfkj oizxc
AMIGA:\u\w> exit
AMIGA:amiga~> _
RudiC
5
Why sed ? Try "parameter expansion":
echo ${1//\\\\n/ }
/fin/app/01/scripts /fin/app/01/sql
Fully POSIX compliant using OP's parameters:
#!/usr/local/bin/dash
# check.sh
# $1 is '/fin/app/01/scripts\\n/fin/app/01/sql'
text=$( echo $( echo $1 ) )
echo $text
Results using as before...
Last login: Tue Sep 3 23:00:12 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./check.sh '/fin/app/01/scripts\\n/fin/app/01/sql'
/fin/app/01/scripts /fin/app/01/sql
AMIGA:amiga~/Desktop/Code/Shell> _
Sorry, but it does not give correct output. See below:
Look at the trailing \ after the first string /fin/app/01/scripts\
cat check.sh
str=`echo ${1//\\\\n/ }`
echo $str>check.row
--- Post updated at 05:11 AM ---
This does not work for me. See my test below.
cat check.sh
str=$( echo $( echo $1 ) )
echo $str>check.row
Also, I intend to run this on ksh shell as well.
--- Post updated at 05:13 AM ---
This is not a new line but delimiter of type string "\\n" i guess.
--- Post updated at 05:26 AM ---
@MadeInGermany you seem to have highlighted the core point of this issue.
However, I wanted to know if there is a solution for ksh shell on AiX with backticks ? A non-sed solution would also do. Thank you!!
The echo command is not portable.
Use printf "%s\n" instead.
cat check.sh
str=`printf "%s\n" "$1" | sed -e 's#\\\\n# #g'`
printf "%s\n" "$str"
str=$(printf "%s\n" "$1" | sed -e 's#\\\\n# #g')
printf "%s\n" "$str"
Now ksh and bash should have the same behavior.
1 Like
This uses '/usr/bin/printf' which is fully POSIX compliant.
Just use your 'printf':
#!/usr/local/bin/dash
# check.sh
# Use /usr/bin/printf as that is fully POSIX compliant.
# OSX 10.14.3...
# $1 is '/fin/app/01/scripts\\n/fin/app/01/sql'
text=$( /usr/bin/printf "%b" $( /usr/bin/printf "%b" $1 ) )
text=$( /usr/bin/printf "%b " ${text} )
# Without trailing newline:
# /usr/bin/printf "%s" "${text%?}" > /tmp/check.row
# With trailing newline:
/usr/bin/printf "%s\n" "${text%?}" > /tmp/check.row
# Check results...
echo ""
cat /tmp/check.row
echo ""
hexdump -C /tmp/check.row
echo ""
Results using the same machine as before.
Last login: Wed Sep 4 10:27:46 on ttys000
AMIGA:amiga~> cd Desktop/code/Shell
AMIGA:amiga~/Desktop/code/Shell> ./check.sh '/fin/app/01/scripts\\n/fin/app/01/sql'
/fin/app/01/scripts /fin/app/01/sql
00000000 2f 66 69 6e 2f 61 70 70 2f 30 31 2f 73 63 72 69 |/fin/app/01/scri|
00000010 70 74 73 20 2f 66 69 6e 2f 61 70 70 2f 30 31 2f |pts /fin/app/01/|
00000020 73 71 6c 0a |sql.|
00000024
AMIGA:amiga~/Desktop/code/Shell> _
1 Like