Im trying to get the following script to work, but Im having some issues:
g++ -g -c $1
DWARF=echo $1 | sed -e `s/(^.+)\.cpp$/\1/`
and Im getting -
./dcompile: line 3: test3.cpp: command not found
./dcompile: command substitution: line 3: syntax error near unexpected token `^.+'
./dcompile: command substitution: line 3: `s/(^.+)\.cpp$/\1/'
sed: option requires an argument -- 'e'
and then bunch of stuff on sed usage. What I want to do is pass in a cpp file and then extract the file name without the .cpp and put it into the variable DWARF. I would also like to later use the variable DWARF to do the following -
readelf --debug-dump=info $DWARF+".o" > $DWARF+".txt"
But Im not sure how to actually do on the fly string concats, so please help with both those issues.
You actually need to execute the command:
DWARF=$(echo $1 | sed -e 's/(^.+)\.cpp$/\1/')
The error message is a shell error because your original statement
DWARF=echo $1 | sed -e `s/(^.+)\.cpp$/\1/`
is actually parsed like this
run s/(^.+)\.cpp$/\1/
set DWARF=echo
run the command $1 | ...
So when it says test3.cpp: command not found I assume that you are running with argument test3.cpp and it's literally trying to execute that file
You also need to wrap the sed script in single quotes, not backticks
In BASH you can crop off the extension from $1 by
${1%*.cpp}
if you need to set the DWARF var use
DWARF="${1%*.cpp}"
or just reference $1 as
readelf --debug-dump=info "${1%*.cpp}.o" > "${1%*.cpp}.txt"
which will chop off the rightmost .cpp so test.cpp.cpp will be test.cpp
You can use awk for this:
$ var="testing.cpp"
$ DWARF=$(awk -F. '{print $1}' <<< $var)
$ echo "$DWARF"
testing
Related
I'm trying to figure out a command to parse the following file content:
Operation=GET
Type=HOME
Counters=CacheHit=0,Exception=1,Validated=0
I need to extract Exception=1 into its own line. I'm fiddling with awk, sed and grep but not making much progress. Does anyone have any tips on using any unix command to perform this?
Thanks
Since your file is close to bash syntax, there is a fun little trick you can do to make bash itself parse the file. First, use some program like tr to transform the input into a something bash can parse, and then "source" that, which will create shell variables you can expand later to get the values.
source <(tr , $'\n' < file_name_goes_here)
echo $Exception
Many ways to do this. Here is one assuming the file is called "file.txt". Grab the line you want, replace everything from the start of the line up to Except with just Except, then pull out the first field using comma as the delimiter.
$ grep Exception file.txt | sed 's/.*Except/Except/g' | cut -d, -f 1
Exception=1
If you wanted to use gawk:
$ grep Exception file.txt | sed 's/.*Except/Except/g' | gawk -F, '{print $1}'
Exception=1
or just using grep and sed:
$ grep Exception file.txt | sed 's/.*\(Exception=[0-9]*\).*/\1/g'
Exception=1
or as #sheltter reminded me:
$ egrep -o "Exception=[0-9]+" file.txt
Exception=1
No need to use a mix of commands.
awk -F, 'NR==2 {print RS$1}' RS="Exception" file
Exception=1
Here we split the line by the keyword we look for RS="Exception"
If the line has two record (only when keyword is found), then
print first field, separated using command, with Record selector.
PS This only works if you have one Exception field
I want to get the part of the filename by using AWK command. For,example my filename will be like ABC_20100702001500.CSV. I want to get YYYYMMDD format from my filename to create a directory. I tried with
name=$(awk -F"." '{print $f}' | awk -F"_" '{print $NF}').
But its shows error like syntax error near unexpected token `name=awk'. How could I resolve the problem. Please correct me with correct syntax.
You may want to do this in Bash alone.
Given:
$ st="ABC_20100702001500.CSV"
You can use parameter expansion to remove the front and back portion:
$ tmp="${st#*_}"
$ echo "${tmp%.*}"
20100702001500
Or, Bash has regex capability as well:
$ [[ $st =~ ^[^_]*_([^.]+) ]] && echo ${BASH_REMATCH[1]}
20100702001500
Or, use sed if you have an older non Bash shell:
$ echo "$st" | sed -E 's/^[^_]*_//; s/\..*$//'
20100702001500
I want to use SED in order to substitute a placeholder (##ERROR_MSG##) contained in a .txt file with the content of a variable ($ERROR_MSG)
here the command I use:
cat FILE.TXT | sed "s/##ERROR_MSG##/$ERROR_MSG/"
here what is contained in $ERROR_MSG (contains special characters and is multi line)
ERROR:
ORA-12170: TNS:Connect timeout occurred
ERROR:
ORA-12162: TNS:net service name is incorrectly specified
SP2-0306: Invalid option.
Usage: CONN[ECT] [{logon|/|proxy} [AS {SYSDBA|SYSOPER|SYSASM}] [edition=value]] where <logon> ::= <username>[/<password>][#<connect_identifier>]
<proxy> ::= <proxyuser>[<username>][/<password>][#<connect_identifier>]
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus
I recieve the following error message:
sed: -e expression #1, char 22: unterminated `s' command
The only robust way to do this, which will work with any value of $ERROR_MSG is:
awk -v old="##ERROR_MSG##" -v new="$ERROR_MSG" 's=index($0,old){$0 = substr($0,1,s) new substr($0,s+length(old))} 1' file
try this:
sed "s+##ERROR_MSG##+$ERROR_MSG+" FILE.TXT
your line didn't work because the text in $ERROR_MSG contains slash /.
edit:
try this awk oneliner too:
awk -v t="$ERROR_MSG" '{sub(/##ERROR_MSG##/,t)}7' FILE.TXT
I am having a log file a.log and i need to extract a piece of information from it.
To locate the start and end line numbers of the pattern i am using the following.
start=$(sed -n '/1112/=' file9 | head -1)
end=$(sed -n '/true/=' file9 | head -1)
i need to use the variables (start,end) in the following command:
sed -n '16q;12,15p' orig-data-file > new-file
so that the above command appears something like:
sed -n '($end+1)q;$start,$end'p orig-data-file > new-file
I am unable to replace the line numbers with the variables. Please suggest the correct syntax.
Thanks,
Rosy
When I realized how to do it, I was looking for anyway to get line number into a file containing the requested info, and display the file from that line to EOF.
So, this was my way.
with
PATTERN="pattern"
INPUT_FILE="file1"
OUTPUT_FILE="file2"
line number of first match of $PATTERN into $INPUT_FILE can be retrieved with
LINE=`grep -n ${PATTERN} ${INPUT_FILE} | awk -F':' '{ print $1 }' | head -n 1`
and the outfile will be the text from that $LINE to EOF. This way:
sed -n ${LINE},\$p ${INPUT_FILE} > ${OUTPUT_FILE}
The point here, is the way how can variables be used with command sed -n:
first witout using variables
sed -n 'N,$p' <file name>
using variables
LINE=<N>; sed -n ${LINE},\$p <file name>
Remove the single quotes thus. Single quotes turn off the shell parsing of the string. You need shell parsing to do the variable string replacements.
sed -n '('$end'+1)q;'$start','$end''p orig-data-file > new-file
I tried to insert a text to the first line
of a file using sed. I do this inside a sh
script.
But why it hangs at the line of sed execution?
#! /bin/sh
# Command to execute
# ./mybashcode.sh test.nbq
nbqfile=$1
nbqbase=$(basename $nbqfile nbq)
taglistfiletemp="${nbqbase}taglist_temp"
taglistfile="${nbqbase}taglist"
./myccode $nbqfile |
sort |
uniq -c |
awk '{print $2}' > $taglistfiletemp
noftags=$(wc -l $taglistfiletemp | awk '{print $1}')
echo $noftags
# We want to append output of noftags
# to the first line of taglistfile
sed '1i\
$noftags' > $taglistfile
# why it hangs here
# the content of taglistfile is NIL
I'm not sure what you are trying to do with sed but it needs two inputs, the script (usually a search/replace) and the data you want to perform it on. If you only specify one it assumes it has got the regular expression and waits for data on stdin. As you haven't supplied anything on stdin it'll hang indefinitely.
In addition, you have '$noftags' rather than "$noftags". The prior will output $noftags and the latter the contents of the variable, as single quotes do not allow variable expansion.
Have I got something wrong here?
Or, all you want to do is insert some text at the start of another file?
# $NewInitialText
# $fileToInsertInto
echo $NewInitialText > temp.file.txt
cat $fileToInsertInto >> temp.file.txt
mv temp.file.txt $fileToInsertInto
Is that easier done than sed? -- Pun intended I guess.
it hangs because you forget to supply sed with the input file.
....
...
sed -i.bak "1i $noftags" $taglistfile
...